Perhaps you should try some spelling variations:
data communication » data communications
communication cost » communication costs, communication costa, communications costs
models development » model development, module development, model developments
relations under » relations united, equations under, obligations under
technology 2.2 » technology _, technology 1, technology 3
2.2 relations » 1.2 relations, 2.4 relations, 2.2 relational
under phone » under one, under change
cost models » cost model, logit models
china dank » china data, china den, china daqing

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

• Adding a wildcard symbol may retrieve word variants: technology 2.2 relations under phone data communication cost models development china dank.*.