Perhaps you should try some spelling variations:
development century » development center, development centers, development centre
communication cost » communication costs, communication costa, communications costs
oral communication » personal communication
clean development » human development, urban development
technology soc » technology shock, technology some, technology set
relation based » relations based, creation based, reaction based
soc relation » shot relation, soc correlation, hoc regulation
based policy » land policy
century rice » century race, century rise, century bce
policy oral » policy moral, policy rural, policy olav
cost clean » costs clear

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

• Adding a wildcard symbol may retrieve word variants: technology soc relation based policy oral communication cost clean development century rice.*.