Perhaps you should try some spelling variations:
"middle explant culture" » "middle explant cultures", "middle england culture", "middle plane culture", "riddle explain culture", "middle exprint culture", "middle exexplant cultures", "middle exart culture"
"middle plant culture" » "middle print culture", "middle explant cultures", "middle art culture", "middle plane culture", "middle part culture", "middle point culture"
"middle place culture" » "middle police culture", "middle slice culture", "middle race culture", "middle phase culture", "middle class culture", "middle age culture"

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: (((("middle plant culture") OR ("middle place culture"))) OR ("middle explant culture"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"middle plant culture\") OR (\"middle place culture\"))) or (\"middle explant culture\"))*".
• Removing quotes may allow a broader search: (((( middle plant culture ) OR ( middle place culture ))) or ( middle explant culture ))*.