Perhaps you should try some spelling variations:
"open resources population" » "open resources simulation", "open resources pollution", "open resources production", "ocean resources population", "open sources population", "own resources population", "open sourcess population"
"open sourcess population" » "open source population", "open source populations", "open resources populations", "open sources population", "open source's population"
"open resource selection" » "open resource allocation", "open resource reservation", "ocean resource selection", "open source selection", "open sources selection"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("open resources population") OR ("open sourcess population"))) OR ("open resource selection")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"open resources population\") OR (\"open sourcess population\"))) or (\"open resource selection\"))".
• Removing quotes may allow a broader search: (((( open resources population ) OR ( open sourcess population ))) or ( open resource selection )).
• Adding a wildcard symbol may retrieve word variants: (((("open resources population") OR ("open sourcess population"))) or ("open resource selection"))*.