Truncation is a search method used in databases in which a word ending is replaced by a symbol. Different databases may use different symbols such as the asterisk (*), a question mark (?) or a dollar sign ($). Please check the database you are using to determine which symbol you should use.
Psycholog* - returns following the words Psychology or Psychologist or psychological
Phrases - quotation marks can be your best friend "Athlete's foot" without " " you could get might get articles about athlete's shoes and their effect on the foot.
Use AND to narrow a search and retrieve records containing all of the words it separates, e.g. adolescents AND children will only find records containing both these words.
Use OR to broaden a search and retrieve records containing any of the words it separates, e.g.adolescents OR children will find records containing adolescents only, children only, or both words.
Use NOT to narrow a search and retrieve records that do not contain the term following it, e.g. adolescents NOT children will find records that contain adolescents, but will not contain the word children.