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The following operators can be used in either the basic or the
advanced search pages by entering them directly in the search box.
1. "and" "&" "*"
Connecting words using "and" (or equivalents "&", "*"), or by using normal spacing
between words, requires that the connected search terms occur concurrently in search
results.
Examples: legal and system
legal
& system
legal
* system
legal
system
Such a search requires that "legal" and "system" exist concurrently in search results,
but does not require that search results include the term "legal system."
2. "or" "+" "|"
Connecting words using "or" (or equivalents "+", "|") requires that at least one
of the connected search terms occur in search results.
Examples: legal or system
legal
+ system
legal
| system
Such a search requires that either "legal" or "system" exist in search results.
3. "!" "-"
Connecting words using "!" (or equivalent "-") requires that the term following
the connector not occur in search results.
Examples: legal ! system
legal
- system
Such a search requires that "legal" exist in search results and that "system" not
exist in the same search results.
4. Phrase searching (using " ")
Putting search terms in quotations requires that such terms exist is the specified
sequential order.
Example: "commissioned customs declarations"
Such a search requires that search results include the exact phase found in quotation
marks.
中文關鍵詞中可使用的連接詞：
1. “&”：意為邏輯“與”，指檢索結果中必須全部包含其所連結的多個關鍵詞。
2. “ and ”：同“&”。
3. “ ”（空格）：同“&”。
4. “*”：同“&”。
5. “+”： 意為邏輯“或”，指檢索結果中將包含其所連結的某一個或多個關鍵詞。
6. “ or ”：同“+”。
7. “|”：同“+”。
8. “!”：意為邏輯“非”，指檢索結果中包含其連結的前一個關鍵詞，但不能包含其連結的后一個關鍵詞。
9. “-”：同“!”。
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