Perhaps you should try some spelling variations:
communication pain » communication part, communication plan, communication patient
development child » development chile, development china, development build
de communication » mobile communication, online communication
technology 3.1 » technology 1, technology 2.2, technology _
3.1 relative » 3.3 relative, 2.1 relative, 3.2 relative
relative de » relative sea, relative age, relative _
pain energy » win energy, can energy, ran energy
de prices » do prices, debt prices, set 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 de prices de communication pain energy development child labor.*.