Perhaps you should try some spelling variations:
communication pain » communication part, communication plan, communication patient
development build » development child, development building, development band
de communication » mobile communication, online communication
technology 6.1 » technology 3.1, technology 2.1, technology 4.1
6.1 relative » 2.1 relative, 4.1 relative, 6.4 relative
relative de » relative sea, relative age, relative _
pain energy » win energy, can energy, ran energy
build labor » child labor, bold labor, child labour
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 6.1 relative de prices de communication pain energy development build labor.*.