CATEGORY SEARCH: For broad topics, choose Categories, Sub-categories or both. With big result sets you may get better refinement picking both categories and sub-categories. Multiple selections in a single list are 'OR'ed. Selections of different lists are 'AND'ed between lists.
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KEYWORD SEARCH: Normally you will get best results by selecting just keywords. Results are unpredictable if you mix a Category search with a Keyword search.
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CATEGORIES
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SUB-CATEGORIES
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KEYWORDS
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