Perhaps you should try some spelling variations:
skill development » skills development, social development, rural 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 sea » relative _
sea prices » tea prices, set prices, real prices
case labor » care labor, based labor, male labor
prices de » prices does, prices _, prices a
3 skill » 3 skills, _ skill, a skill

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 sea prices de communication 3 skill development case labor.*.