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

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