Perhaps you should try some spelling variations:
models development » model development, module development, model developments
communication cost » communication costs, communication costa, communications costs
development case » development china
7 communication » 3 communication, 4 communication, de communication
technology 2.2 » technology _, technology 1, technology 3
relations cost » relations post, relations cross, relations case
2.2 relations » 1.2 relations, 2.4 relations, 2.2 relational
cost models » cost model, logit models
cost share » cost shares, cost aware, cost scale
case birth » rate birth, sale birth
share 7 » share _, share b, shared _

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

• Adding a wildcard symbol may retrieve word variants: technology 2.2 relations cost share 7 communication cost models development case birth.*.