CNET article "Five ways to depersonalize Google search results"
Library databases NEVER apply filters that you are unaware of. Search results are not influenced by previous searches unless YOU decide to leave selected filters in place!
Think of keywords that relate to your topic to begin your reasearch.
Boolean Operators are the words AND, OR and NOT that can be used to combine keywords in ways to narrow your search results.
Use Boolean Modifiers to further define and narrow your search.
Look for the special limiters for age, gender, document type, to improve your search results.
The following databases don't have the special features of Web of Knowledge, but do contain significant full-text.