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