A folder search lets you search PDF files in one folder (with or without sub-folders) and lets you limit the search according to values in standard fields (author, title, subject, keywords, etc.) of the PDF Properties.
To search in a specified folder
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1. Click the 
Search tool in the File toolbar to open the Search dialog box.
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Type in a search phrase.
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Choose Selected Folder from the Look In drop-down list, and browse to select a target folder in the Browse for Folder dialog box. The selected folder (local or network folder) will be displayed in the Look In box.
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Select search options; for folder searches you have an extra option: Include Subfolders. Select it to include all sub folders.
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Click >> Advanced to use additional search criteria. For details, see Selecting Search Options.
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Click Search. The Results list will show the occurrences.
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Click a result in the list to display the appropriate page that contains the search result highlighted.
Note
If you have folders with a large number of PDF files you do not plan to modify much, searching can be faster if you generate an index for them and use index searching.
