Perhaps you should try some spelling variations:
voice communication » voice communications, mobile communication, device communication
development plans » development planning, development policy, development policies
technology state » technology strategy, technology system, technology study
case development » care development, based development, scale development
state relations » state regulation, trade relations, race relations
costs case » costs cash
plans a » plans _
4 zur » 1 zur, 2 zur, 3 zur
4 zu » 4 zum, 2 zu, 1 zu

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "technology state relations ((4 zu) OR (4 zur)) voice communication costs case development plans a.~".
• Adding a wildcard symbol may retrieve word variants: technology state relations ((4 zu) OR (4 zur)) voice communication costs case development plans a.*.