Ask a question that you want answered. OR Finds documents containing at least one of the specified words or phrases. AND NOT Excludes documents containing the specific word or phrase. Try to specify the minimum amount of information which will yield a positive search result. You will take less time to define it, and the search itself will take less time to return a result.
Searches use 'AND' logic.
If more than one field is searched on, the search looks for records that match the parameters described in the first field AND the second field AND any other fields. To specify multiple terms within any search field, separate them by a space. If more than one term is specified in any search field, the order of the terms helps determine which records are found. If you need to access a particular set of units, instead of repeated searches on single unit codes, try defining the search so that it will bring forth the required units as part of a list.