| To formulate your search query
you may use keywords and any combination of the following operators:
'AND', 'OR', 'AND NOT'. Keywords or search expressions may also be truncated using the
$ sign to widen or narrow down your search.
Example: |
| (Viet Nam or Vietnam) and urea |
Search
the database for records about urea in Viet Nam |
| rice and not
(upland or rainfed) and nitrogen |
Search
the database for records
about nitrogen on rice excluding upland or rainfed rice. |
| ammoni$ |
Search
the database for records containing 'Ammoni' including Ammonia, Ammonium,
... |
