Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
time communications » time communication, type communications, wartime communications
power development » water development, career development, hydropower development
development age » development stage, development a, development aid
risk relations » risk regulations, milk relations, risk reductions
relations 4.3 » relations 6.3, relations 3, relations 2.1
costs power » cost power, costs per, costs peter
place time » space time
age aortic » acute aortic, after aortic
4.3 place » 4.5 place, 4.2 place, 4.4 place

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

• Adding a wildcard symbol may retrieve word variants: technology risk relations 4.3 place time communications costs power development age aortic.*.