1. Keyword search

This might be the default way to use a search engine. Simply enter one or more keywords and the search engine will return all pages that contain either all keywords (AND query) or at least one keyword (OR query). You can predefine the query type in the module configuration or you can change it dynamically by adding a checkbox named "query_type" to the search form.

2. Phrase search

Sometimes you only need results that include an exact phrase. E.g. searching for hydrophilic IOL would also return pages with other IOLs. To narrow your results, simply put quotation marks around your search term ("hydrophilic IOL" instead of hydrophilic IOL) and the search engine will only return pages that contain the exact phrase. 

3. Forcing a keyword

This feature is particularly useful when you are searching for multiple keyword (OR query) but still want ensure that a page contains a certain keyword. To force a keyword, put a plus (+) in front of it (without space). Therefor your search term should be hydrophilic IOL +3-piece.

4. Excluding a keyword

To exclude a keyword, put a minus (-) in front of it. Thus, pages containing this keyword will not be returned. Therefor your search term should be hydrophilic IOL -3-piece.