Perhaps you should try some spelling variations:
phase communication » change communication, based communication, face communication
development age » development stage, development a, development aid
technology 3.1 » technology 1, technology 2.2, technology _
3.1 relation » 4.1 relation, 3.1 regulation, 2.3.1 relation
relation 8.3 » relation 4.3, relation 5.3, relation 3.3
crisis phase » crisis part
8.3 crisis » 13.3 crisis, 2.1 crisis, 3.1 crisis
age aortic » acute aortic, after aortic
costs 2 » costs 20, costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technology 3.1 relation 8.3 crisis phase communication costs 2 development age aortic.*.