Perhaps you should try some spelling variations:
rural development » social development
de communication » mobile communication, online communication
development case » development china
communication 3 » communication _, communication a
technology 4.2 » technology 2.2, technology 3.2, technology 4.1
4.2 relative » 2.2 relative, 1.2 relative, 3.2 relative
relative set » relative sea, relative asset, relative de
set prices » asset prices, spot prices, meat prices
case labor » care labor, based labor, male labor
prices de » prices does, prices _, prices a
3 rural » a rural, 2 rural, 4 rural

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

• Adding a wildcard symbol may retrieve word variants: technology 4.2 relative set prices de communication 3 rural development case labor.*.