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The BioMedNet search used to offer some very powerful features, but the new interface unfortunately seems to have been oversimplified and a list of operators does not appear to be provided any more. It is possible that all the operators mentioned below will still work by incorporating them into a Boolean expression in the search box in simple mode. For this reason, the description below of Boolean searching in the simple mode has been been retained. Otherwise, it is possible in the advanced search to search for terms in up to three fields which are selected from drop-down menus. In each case, it is possible to specify that any or all of the search terms should be present, or that they are being entered as a phrase.