Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
transition series » transition period, transition countries
price transition » peace transition, place transition, rich transition
supply price » supply service, supply private, supply pricing
supply scale » supply case, supply scheme, supply social

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

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