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When you use double quotes in ScienceDirect search,

AND is not automatically inserted between terms.
B. Punctuation is ignored.
C. Wildcards are searched as wildcards.
D. Plurals are included.

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When you use brackets in ScienceDirect search:

A. Stop words, punctuation, and special characters are searched.
B. Stop words, punctuation, and special characters are not searched.
C. Wildcards are searched as characters.
D. Wildcards are not searched as characters.

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PQDT records are included in global important academic databases:：

A. Emtree
B. MeSH
C. excelpta medica database
D. Medline

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Emtree is exactly the same as Mesh.

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EMBASE database is the electronic version of the printed search tool excelpta Medica (Medical Abstracts of the Netherlands).

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When you use double quotes in ScienceDirect search,

AND is not automatically inserted between terms. B. Punctuation is ignored. C. Wildcards are searched as wildcards. D. Plurals are included.

When you use brackets in ScienceDirect search:

PQDT records are included in global important academic databases:：

Emtree is exactly the same as Mesh.

EMBASE database is the electronic version of the printed search tool excelpta Medica (Medical Abstracts of the Netherlands).

AND is not automatically inserted between terms.
B. Punctuation is ignored.
C. Wildcards are searched as wildcards.
D. Plurals are included.