Perhaps you should try some spelling variations:
"experimental forest" » "experimental test", "experimental stress", "experimental progress"
"experimental facts" » "experimental aspects", "experimental facilities", "experimental fluid"
"experimental films" » "experimental film", "experimental field", "experimental fluid"

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 facts") OR ((("experimental films") OR ("experimental forest")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"experimental facts\") or (((\"experimental films\") OR (\"experimental forest\"))))".
• Removing quotes may allow a broader search: (( experimental facts ) or ((( experimental films ) OR ( experimental forest )))).
• Adding a wildcard symbol may retrieve word variants: (("experimental facts") or ((("experimental films") OR ("experimental forest"))))*.