Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
biotechnology some » biotechnology case, biotechnology from, technology some
models development » model development, module development, model developments
de communication » mobile communication, online communication
development from » development forum, development fund
some relation » comme relations, role relations, shape relation
relation test » relations west, relation 21st, relation des
cost models » cost model, logit models
test time » best time, next time, past time
from dark » from dar, from darth, from data
time de » time die, estime de, time done

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

• Adding a wildcard symbol may retrieve word variants: biotechnology some relation test time de communication cost models development from dark.*.