Search by publication date
The field "Published after" allows you to search items published after a certain date.
For your search don't mention the day and the month and please enter the year with four digits, e.g.: 1998.

Search by combining criteria
You can combine different terms using the boolean operators : AND, OR, EXCEPT in order to narrow down or broaden your search.
The operators must be entered as follows:
And = &
Or = /
Except = *

Troncature
The troncature is implicit, e.g., by entering the term "pollut" it will retrieve the following combinations: pollutant, pollute, polluted, pollution, pollutor.