Perhaps you should try some spelling variations:
"population migration class societies." » "population information class societies.", "population division class societies.", "population migration loss societies.", "population migration crisis societies.", "population migration flows societies.", "population migration class society.", "population migration law societies."
"collective actions e society." » "collective action e society.", "corrective actions e society.", "corrective action e society.", "collective actions _ society.", "collective actions a society.", "collective action _ society.", "collective actions open society."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("population migration class societies.") OR ("collective actions e society."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"population migration class societies.\") OR (\"collective actions e society.\"))*".
• Removing quotes may allow a broader search: (( population migration class societies. ) OR ( collective actions e society. ))*.