Perhaps you should try some spelling variations:
interaction series » interactions series, interaction studies, interaction terms
irrigation schemes » irrigation scheme, irrigation systems
delta irrigation » et irrigation, alfa irrigation, mega irrigation
support delta » supporto della, support data, support de
a interaction » ai interaction, 2 interaction, 3 interaction
support a » support _

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

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