Perhaps you should try some spelling variations:
"crisis communication israel" » "risk communication israel", "mass communication israel", "crisis communication issues", "crisis communication iran", "crisis communication iraq"
"u.s communications costs" » "u.s communication costs", "u.s communications _", "3.1 communications costs", "les communications costs", "nps communications costs"
"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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("u.s communications costs") OR ("crisis communication israel"))) OR ("u.s migration history"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"u.s communications costs\") OR (\"crisis communication israel\"))) OR (\"u.s migration history\"))".
• Removing quotes may allow a broader search: (((( u.s communications costs ) OR ( crisis communication israel ))) OR ( u.s migration history )).
• Adding a wildcard symbol may retrieve word variants: (((("u.s communications costs") OR ("crisis communication israel"))) OR ("u.s migration history"))*.