Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
trade irrigation » pradesh irrigation, scale irrigation, grain irrigation
grant internet » german internet, many internet, present internet
export trade » export taxes, export base, export tax
service. » services.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( export trade irrigation schemes. ) or ( support grant internet service. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( export trade irrigation schemes. ) OR ( support grant internet service. )).
• Adding a wildcard symbol may retrieve word variants: (( export trade irrigation schemes. ) or ( support grant internet service. ))*.