Perhaps you should try some spelling variations:
general resources » mineral resources, mineral resource, generating resources
genetic resource » genomic resources, genetic research, dynamic resource
general sources » mineral resources, external sources

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %((((genetic resources) OR (((general resources) OR (general sources))))) OR (genetic resource))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((genetic resources) or (((general resources) OR (general sources))))) or (genetic resource))%22".
• Adding a wildcard symbol may retrieve word variants: %((((genetic resources) or (((general resources) OR (general sources))))) or (genetic resource))%22*.