Perhaps you should try some spelling variations:
"middle plane culture" » "middle place culture", "middle plan culture", "middle plate culture", "middle lane culture"
"middle plant culture" » "middle explant culture", "middle print culture", "middle explant cultures", "middle place culture", "middle part culture", "middle point culture"

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: "((\"middle plane culture\") OR (\"middle plant culture\"))".
• Removing quotes may allow a broader search: (( middle plane culture ) OR ( middle plant culture )).
• Adding a wildcard symbol may retrieve word variants: (("middle plane culture") OR ("middle plant culture"))*.