Perhaps you should try some spelling variations:
"supply data integration theories." » "supply data integration theorems.", "supply data integrationstheorie 2.", "supply data integration theory.", "supply data integrity theories."
"support migrant integration series." » "support market integration series.", "support migrant integration services.", "support migrant interaction series.", "support migrant integration server.", "support migrants integration series.", "support grant integration series.", "supporting migrants integration series."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply data integration theories.") or ("support migrant integration series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply data integration theories.") OR ("support migrant integration series.")).
• Removing quotes may allow a broader search: (( supply data integration theories. ) or ( support migrant integration series. )).
• Adding a wildcard symbol may retrieve word variants: (("supply data integration theories.") or ("support migrant integration series."))*.