You can use standard Boolean operators in the Write Your Own part of Advanced Search.
You can either type the operators, or click on them from the Available Fields list.
If you type the operators, they must be entered in upper case and within square
brackets.
[AND]
Retrieves records containing at least one occurrence of each of the query terms (i.e. all
the query terms entered must appear in the retrieved documents).
[OR]
Retrieves records containing at least one occurrence of any of the query terms (i.e. one or
more of the terms entered must appear in the retrieved documents).
In Text Search, selecting any of the above is equivalent to searching with a
logical [OR]. Selecting all of the above is equivalent to searching with a logical [AND].
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