Perhaps you should try some spelling variations:
"experimental factors" » "experimental facts", "experimental fracture", "experimental reactor"
"experimental field" » "experimental fluid", "experimental facts"
"experimental films" » "experimental film", "experimental facts", "experimental forest"

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: (("experimental field") OR ((("experimental films") OR ("experimental factors")))).
• Removing quotes may allow a broader search: (( experimental field ) or ((( experimental films ) or ( experimental factors )))).
• Adding a wildcard symbol may retrieve word variants: (("experimental field") or ((("experimental films") or ("experimental factors"))))*.