Perhaps you should try some spelling variations:
class communication » mass communication, plans communication, crisis communication
communication fast » communication fifth, communication from, communication five
clean development » human development, urban development
development intel » development inter, development index, development internal
relation 5.3 » relation 4.3, relations 5.1, relations 5.2
crisis class » crisis case, crisis cases, crisis cross
5.3 crisis » 8.3 crisis, 13.3 crisis, 15.2 crisis
fast clean » act clean, fast can
intel tom » intel atom, intro tom, intel txt

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

• Adding a wildcard symbol may retrieve word variants: technology _ relation 5.3 crisis class communication fast clean development intel tom.*.