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
open developments » open development, oer developments, modern developments
developments from » development from, developments after, developments _
system relations » systemic relations, system operations, system regulation
relations 3 » relations _, relations a
cross oral » cross modal, class oral
cost open » post open
3 cross » 2 cross, 1 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 3 cross oral communication cost open developments from africa.*.