Perhaps you should try some spelling variations:
de communication » mobile communication, online communication
rail development » brain development, rural development, skill development
technology 3.1 » technology 1, technology 2.2, technology _
3.1 relative » 3.3 relative, 2.1 relative, 3.2 relative
relative set » relative sea, relative asset, relative de
china labor » china labour, china's labor, child labor
set prices » asset prices, spot prices, meat prices
prices de » prices does, prices _, prices a

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

• Adding a wildcard symbol may retrieve word variants: technology 3.1 relative set prices de communication _ rail development china labor.*.