Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
ratios irrigation » national irrigation, gravity irrigation, ranking irrigation
export ratios » export ratio, export duties
data banking » data linking, late banking, state banking
import data » import duty
services. » series.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( export ratios irrigation schemes. ) or ( import data banking services. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( export ratios irrigation schemes. ) OR ( import data banking services. ))*.