Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
banking series » banking services, banking service, banking crises
data banking » data linking, late banking, state banking
export bans » export base, export bias, export sales
import bans » import taxes
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) OR (import bans)) irrigation schemes. ) or ( import data banking series. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((export bans) OR (import bans)) irrigation schemes. ) OR ( import data banking series. )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((export bans) OR (import bans)) irrigation schemes. ) or ( import data banking series. ))".
• Adding a wildcard symbol may retrieve word variants: (( ((export bans) OR (import bans)) irrigation schemes. ) or ( import data banking series. ))*.