You have several options to limit the search and thus obtain more precise results:
match all words (standard)
If you search for multiple words, separated by spaces, you will find all pages that contain all of the entered words (AND search).
match any word
If you search for multiple words, separated by spaces, you will find all pages that contain one or more of the entered words (OR search).
Enclosing a phrase in quotes (") will search for the complete phrase, e.g. "consultation liaison".
search with wildcards
Placing an asterisk (*) before or after a word will find pages containing different forms of the word, e.g. psycho* will find pages containing psychodynamic, psychosomatics, psychotherapy, etc., *therapy will find pages containing psychotherapy, etc.