Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
developments safe » developments after, developments since, development saber
technology class » technology glass, technology case, technology cross
new developments » _ developments
class relations » les relations, class recreation
relations 2.3.2 » relations 2.1.2, relations 2.6.2, relations 3.3.2
3 communication » 4 communication, de communication, data communication
safe abortion » unsafe abortion, unsafe abortions
2.3.2 crisis » 2.2.2 crisis, 2.3.1 crisis, 6.3.2 crisis
crisis 3 » crisis _, crisis a, crisis 1
cost new » post new, east new, cost e3

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

• Adding a wildcard symbol may retrieve word variants: technology class relations 2.3.2 crisis 3 communication cost new developments safe abortion.*.