Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
vector development » sector development, sector developments, factor development
transfer learning » teacher learning
oil communication » oral communication, social communication, moral communication
development after » developments after, development master, development matter
cost vector » class vector, reset vector, short vector
learning 3 » learning 1
crisis oil » crisis one, crisis out
after car » after care, after dark, after a
3 crisis » 1 crisis, 19 crisis

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

• Adding a wildcard symbol may retrieve word variants: technology transfer learning 3 crisis oil communication cost vector development after car.*.