Perhaps you should try some spelling variations:
"middle plant culture" » "middle explant culture", "middle print culture", "middle explant cultures", "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"
"middle last culture" » "middle past culture", "middle yeast culture", "middle list cultures", "middle east culture", "middle class culture", "middle late 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 last culture\") OR (((\"middle plant culture\") OR (\"middle place culture\"))))".
• Removing quotes may allow a broader search: (( middle last culture ) OR ((( middle plant culture ) OR ( middle place culture )))).
• Adding a wildcard symbol may retrieve word variants: (("middle last culture") OR ((("middle plant culture") OR ("middle place culture"))))*.