Perhaps you should try some spelling variations:
interaction series » interactions series, interaction studies, interaction terms
migration process » registration process
does interaction » des interactions, dem interaction, os interaction
period migration » perceived migration, personal migration, forced migration
support does » support de, support deep, support crops
short period » short periods, short series

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( support does interaction series. ) or ( short period migration process. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( support does interaction series. ) OR ( short period migration process. ))*.