Perhaps you should try some spelling variations:
integration schemes » integration schengen, integration regimes, integration some
irrigation schemes » irrigation scheme, irrigation systems
basin irrigation » drip irrigation, canal irrigation, farm irrigation
import trade » export trade, import price, import taxes
export basin » export basis, export base, export ban

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

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