All options described below can be combined into any single search
By default search engine finds any match for the searched string: land will also find island, Islands, Land, Lands.
Case sensitive search can be enabled by checking "case sensitive" checkbox.
Avoid too complex searches as they usualy return poor results. Try to specify your search in the simpliest way or using regular expressions as described further below.
BOOLEAN LOGIC
You may use and, or, not to do a more specific search. For example by searching diversity and land you will find all database records containing both diversity and land. Those with just diversity or land will be ignored.
To find documents containing either diversity or land or both you should specify your search as diversity or land.
You can also indicate that for example you would like to find all records containing diversity, except for those with land. In this case in the search field write diversity and not land. Etc...
REGULAR EXPRESSIONS
d.{7}y will find all records including words starting with d ending with y and 7 characters in between. This can be used when correct spelling of the phrase is under doubt.
When you are not sure about correct spelling (number of letters), try to define the unclear part with .*? within search phrase. For example bio.*?y will find biodiversity as well.
One more option to specify uncertainty in your search is to define min and max length of the uncertain place within a phrase. For example you are not sure about the word office - can not just recall whether it has one or two f's. In this case search it as o(f){1,2}ice. Search engine will find all possibly correct matches.
To search a whole word land (ignoring partial matches like island) write it as folows: \s(land)\s or simply put a space in front of land
To search for a common root of the words island, islands, isle, islet (all those words to be found) write your query this way: \s(isl)