With keywords, you can search for related content results in a large quantity of data. In the research process, it happens often to repeatedly adjust the keyword setting in order to obtain more comprehensive and representative analysis results. Use logical works “OR”, “AND”, and “NOT” between keywords to form logical relationship. “OR” means if any of the conditions separated by “OR” is TRUE; “AND” means if all the conditions separated by “AND” are TRUE; “NOT” means if the given condition is NOT TRUE. Phrases as keywords in English should be grouped with quotation marks (“”). Parenthesis () needs to half-width format in English. For example:

• 1. To research a Subject related to the Hong Kong-Zhuhai-Macao Bridge, keywords can be set as:

“Hong Kong-Zhuhai-Macao Bridge’ OR ‘Hong Kong-Macau direct bus” means that the text with either phrase of “Hong Kong-Zhuhai-Macao Bridge” or “Hong Kong-Macau direct bus” are in the search range. Examples of search results text are shown as follow:

a) The completion of the Hong Kong-Zhuhai-Macao Bridge will reshape the urban space of the Pearl River Estuary.

b) The opening of the Hong Kong-Macau direct bus will greatly shorten the travel time between the three places of Hong Kong, Macau, and Zhuhai.

• 2. The above search criteria can be further optimized. For example, in the text, the term “Hong Kong-Zhuhai-Macao Bridge” may not appear all at once as a whole. In this situation, the keyword can be modified as follow:

“Hong Kong-Zhuhai-Macao’ AND ‘Bridge” means that the phrase “Hong Kong-Zhuhai-Macao” and the “Bridge” must both appear in the text at the same time, but do not need to appear as a whole. At this time, if either Condition 1 (Hong Kong-Zhuhai-Macau AND Bridge) or Condition 2 (Hong Kong-Macau direct bus) is true, the text are in the search range, and example search results are shown as follow:

a) In order to enhance the Hong Kong-Zhuhai-Macao linkage, a Bridge was built.

b) The Hong Kong-Macau direct bus greatly facilitates the travel between people in the two places.

• 3. The search conditions allow multi-level logical relationships, such as when the keyword is set as follow:

Condition 1: “Hong Kong-Zhuhai-Macao” AND “Bridge” means that the phrase “Hong Kong-Zhuhai-Macao” and the “Bridge” must both appear in the text at the same time, but do not need to appear as a whole.

Condition 2: “Hong Kong-Macao” AND “Direct Bus” means that the phrase “Hong Kong-Macao” and the phrase “Direct Bus” must both appear in the text at the same time, but do not need to appear as a whole.

Condition 3: Hong Kong-Zhuhai-Macao Bridge.

At this time, if either Condition 1 or Condition 2 or Condition 3 is true, the text are in the search range, and example search results are shown as follow:

a) The bridge that links Hong Kong-Zhuhai-Macao is called the “Mount Everest” of the bridge sector.

b) The direct bus shuttle between Hong Kong-Macao operates 24 hours a day.

c) The Hong Kong-Zhuhai-Macao Bridge has a tripartite law enforcement mechanism.

Note: The logical words “AND”, “OR”, and “NOT” between keywords must be capitalized. English phrases should be quoted with quotation marks “”. And parenthesis () need to be English half-width format.