Wildcards:
  • * to match anything.
  • + to specify AND.
  • - to specify NOT.
  • > to increase contribution.
  • < to decrease contribution.
  • () to group words.
  • ~ decreases relevance.
  • "" to match the expression literally.
Example: +apple +(>turnover < strudel) would return everything matching 'apple turnover' or 'apple strudel', but rank 'apple turnover' higher.