Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
vector development » sector development, sector developments, factor development
pt communication » put communication, et communication, post communication
development aid » development a, development africa, development agenda
relation 3.1 » relations 3.1, relation 3.3, relation 3.4
cost vector » class vector, reset vector, short vector
3.1 crisis » 2.1 crisis, 3 crisis, 11 crisis
crisis pt » crisis _, crisis a

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

• Adding a wildcard symbol may retrieve word variants: technology _ relation 3.1 crisis pt communication cost vector development aid aortic.*.