Truncation (*) allows you to get more records. Ex: fish* will bring up all documents with fish, fishes, fisheries, ...
Using quotation marks will allow you to find an expression. Ex: "coastal environment", "heavy metal"
To narrow or widen your search, you can also use the Boolean connectors AND / OR (uppercase). Those operators can be combined with parentheses. Ex: aquaculture* AND ( "dicentrarchus labrax" OR "sea bass" )
Online help is available for more details
Export search results
Allows you to download the current list of results (up to 2000 entries maximum).