Using special characters to refine searches
To require words: Type the plus symbol (+) before the words that must be in the search results. Typing +cell +roam +voicemail will return only answers that contain all three words.
To exclude words: Type the minus symbol (-) before words you don't want in the search results. Typing cell -biology will return answers that contain the first word but not the second.
To search with a wildcard: Type an asterisk (*) after the initial letters of a word to search for all words or terms that begin with those letters. Typing hand* will return answers containing handset, hands-free, handbook, hand-held, handshake, and handkerchief.
To search using synonyms: Type a tilde (~) before a word to search for answers containing that word as well as synonyms for the word. Typing account will return answers containing account, bill, and invoice.