Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
put communication » post communication, et communication, get communication
trade development » software development
regulation 19 » regulation 1, regulation 11, regulation 12
costly trade » costs trade, country trade, costly than
crisis put » crisis pt, crisis part, crisis past
a aortic » _ aortic, _ artic

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

• Adding a wildcard symbol may retrieve word variants: technology _ regulation 19 crisis put communication costly trade development a aortic.*.