Perhaps you should try some spelling variations:
"nets communication issues" » "nets community issues", "nets communication india", "nets communication united", "lea's communication issues", "mass communication issues", "c's communication issues"
"its communication italy" » "its communication india", "its communication united", "c's communication italy", "mass communication italy", "les communications italy"
"u.s migration history" » "mass migration history", "does migration history", "1 migration history"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"its communication italy\") OR (\"nets communication issues\"))) OR (\"u.s migration history\"))~".
• Removing quotes may allow a broader search: (((( its communication italy ) OR ( nets communication issues ))) OR ( u.s migration history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("its communication italy") OR ("nets communication issues"))) OR ("u.s migration history"))*.