Query Language Tips and Examples:

fishing beach
finds documents containing 'fishing' or 'beach'

fishing or beach
same as above

fishing and beach
finds documents containing both 'fishing' and 'beach'

fishing not beach
finds documents containing 'fishing' but not 'beach'

(fishing not beach) and water
finds documents containing 'water', plus 'fishing' but not 'beach'

water*
finds documents containing words starting with 'water'