Perhaps you should try some spelling variations:
immigration countries » immigration policies
integration report » integration efforts, innovation report
mass immigration » mass migration, _ immigration
supply trade » supply case
supply mass » supply case, supply main, supply many

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply trade integration report. ) or ( supply mass immigration countries. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply trade integration report. ) OR ( supply mass immigration countries. )).
• Adding a wildcard symbol may retrieve word variants: (( supply trade integration report. ) or ( supply mass immigration countries. ))*.