Within search boxes:

• Use & for AND
  e.g. income & tax finds income AND tax
• Use / for OR
  e.g. accounting / auditing
• Use ! for NOT
  e.g. patents ! trademarks
• Use " " to search for a phrase
  e.g. "income tax"
• Use * for truncation
  e.g. account* finds account, accounts, accounting, accountants, etc.
• Use >, <, >=, <= for greater or less than
  e.g. >= 1999 finds dates from 1999 onwards
• Use : to search a range
  e.g. 1999:2003, example:sample
• Use the proximity operators w (within) and p (preceding) to find words near each other
  e.g. articles p3 incorporation finds records with 'articles' up to 3 words before 'incorporation'
  e.g. accounting w5 procedures finds records with these words within 5 words of each other
• More help is available.