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An item's "keywords" are taken from its title, subject headings and author headings. In addition, the following items are keywords:
* Library Of Congress Card Number
* ISBN Number
* ISSN Number
* Standard Technical Report Number
and & or not
If you omit these operators and merely enter keywords, the computer connects your keywords with "and". Thus, entering "CARDIAC SURGERY" is the same as entering "CARDIAC and SURGERY".
Placing "not" in front of a keyword indicates that you want items that are not associated with the keyword in question. For example, entering "CARD not SURG" gets you all items associated with the keyword "CARD" that are not associated with the keyword "SURG".
If you enter more than 2 keywords and fail to group the keywords with parentheses, the computer applies operators from left to right. Thus, if you enter simply "MOUSE and CAT or DOG", your input is interpreted as "(MOUSE and CAT) or DOG". You can use parentheses to convey your real intent, which might be "MOUSE and (CAT or DOG)".