Perhaps you should try some spelling variations:
growth interaction » group interaction, graph interaction, youth interaction
interaction series » interactions series, interaction studies, interaction terms
crowd irrigation » crop irrigation, flood irrigation, from irrigation
supply crowd » supply cost, supply from
systems. » system.

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

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