Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
bans irrigation » tank irrigation, canal irrigation, basin irrigation
taking series » making series, trading series, banking series
export bans » export base, export bias, import bans
import data » import duty

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

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