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To search something as a phrase, surround the terms in double quotations, like this: "welfare state" or "privacy violations"
To search for forms of a word without doing multiple searches, use a truncation/stem function like this: lead* The asterisk replaces 1-9 characters at the end of a word so your results will include LEAD, LEADS, LEADER, LEADERS, LEADING, LEADERSHIP. (In this example, the caveat is that LEAD has more than one meaning and pronunciation, so your result list COULD include material about lead poisoning, pencils, paint, or the chemical symbol Pb!)
Think about terms that may have similar meanings:
Remember different databases will use different terminologies. These can be really evident in the database's THESAURUS or SUBJECT INDEX.