Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
oral communication » personal communication
technology system » technology series, technology sector, technology set
developments from » development from, developments after, developments _
system relations » systemic relations, system operations, system regulation
oer developments » other developments, power developments, open developments
relations 1 » relations _, relations a, relations 3
cross oral » cross modal, class oral
cost oer » cost open, cost e3, cost out
1 cross » 2 cross, 3 cross, 4 cross

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

• Adding a wildcard symbol may retrieve word variants: technology system relations 1 cross oral communication cost oer developments from africa.*.