Perhaps you should try some spelling variations:
"keep firms transaction services." » "keep firms transportation services.", "keep firms sanitation services.", "keep firms transit services.", "keep firms transactional services.", "keep from transaction services.", "keep sales transaction services.", "help firms transaction services."
"held sales transactions costs." » "held market transactions costs.", "held estate transactions costs.", "held land transactions costs.", "held sales transaction costs.", "held sales transactions system.", "heat sales transactions costs.", "hand sales transactions costs.", "led sales transactions costs."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("keep firms transaction services.") or ("held sales transactions costs."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("keep firms transaction services.") OR ("held sales transactions costs.")).
• Removing quotes may allow a broader search: (( keep firms transaction services. ) or ( held sales transactions costs. )).
• Adding a wildcard symbol may retrieve word variants: (("keep firms transaction services.") or ("held sales transactions costs."))*.