Boolean operators can be used in the standard Search mode. Boolean operators are little words that make a big difference in your search. They are used to create logical statements for refining searches. Use the following Boolean operators to create rules for a search to follow:
AND specifies that you want each and every search word grouped by an AND to appear in the results. Example: German AND shepherd would return only results that contain both "German" and "shepherd."
OR yields search results that contain any one or all of the words in your multiple-word query. Example: Yugoslavia OR Bosnia would return results that contain either "Yugoslavia" or "Bosnia," or both terms.
NOT (or the minus sign [-]) excludes words from your search results. Example: Washington NOT George would return results that contain "Washington" but do not contain "George."
[+] (plus sign) yields only search results that include the word to the right of the plus sign. Example: India + Buddha would return results that contain "Buddha" and would give priority to results that also contain "India."
Use parentheses to separate or group Boolean operations into a larger formula:
Example: Cherokee AND (language or alphabet) NOT sequoyah would return results that combine "Cherokee" with either "language" or "alphabet," but would exclude any results that contain "sequoyah."
Example: (Yugoslavia OR Bosnia) AND "war tribunal" would return results that contain the words "war tribunal" in order, and of those results, only those that also contain either the word "Yugoslavia" or the word "Bosnia."
In the standard Search mode, only use hyphens for words that are always hyphenated, and remember that hyphens not enclosed in quotation marks will be interpreted as minus signs (equivalent to the NOT Boolean operator) in the standard Search mode. For example, to search for Epstein-Barr, type Epstein"-"Barr in the Search entry box. Other punctuation marks are not valid and will not affect search results.