boat and sail
boat or sail
boat and (row or sail)
boat* near kayak
And, or and near operators can be used.
(The default is and.)
Searching is not case-sensitive.
Limited wildcard searches are possible, by appending a * to the end
of a word; otherwise the search looks for complete words.
Searching starts at the beginning of a word. You can't look for
segments in the middle of words.
Parentheses force a search order.
Searching for phrases is not supported.