Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
developed control » developing control, developed country, developed content
information lost » information loss, information cost, information list
control trials » control trial, controlled trials, control variables
6.1 developed » 5.1 developed, 6.4 developed, 2.0 developed
lost decade » last decade, first decade
decade data » decade later, decade naval
costs 6.1 » costs 4.1, costs 6.4, costs 2.1

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

• Adding a wildcard symbol may retrieve word variants: technology _ information lost decade data communications costs 6.1 developed control trials.*.