Perhaps you should try some spelling variations:
"support fare integration theories." » "support fare integration theorems.", "support fare integrationstheorie 2.", "support fare integration theory.", "support trade integration theories.", "support die integration theories.", "support farm integration theories.", "support farmers integration theories.", "support future integration theories."
"support state interaction term." » "support state interactions term.", "support scale interaction term.", "support state intervention term.", "support state interaction _.", "support stage interaction term.", "support staff interaction term.", "support start interaction term."

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: (("support state interaction term.") OR ("support fare integration theories."))~.
• Removing quotes may allow a broader search: (( support state interaction term. ) or ( support fare integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support state interaction term.") or ("support fare integration theories."))*.