Perhaps you should try some spelling variations:
theory development » energy development, early development, forestry development
de communication » mobile communication, online communication
development mode » development model, development models, development module
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 tea » relative sea, relative area, relative de
costs theory » cuts theory, crisis theory, chaos theory
tea prices » real prices
mode labor » male labor, core labor, home labor
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 4.2 relative tea prices de communication costs theory development mode labor.*.