Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
when communication » where communication, open communication, sign communication
regulation 1.3.3 » regulation 10.1.3, regulation 11.2.3, regulation 11.3.4
data development » delta development, doha development, data envelopment
technology de » technology does, technology dlt, technology 1
de regulation » trade regulation, use regulations, data regulation
1.3.3 crisis » 13.3 crisis, 13.2 crisis, 2.3.1 crisis
crisis when » crisis what, crisis why, crisis within
cost data » test data

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

• Adding a wildcard symbol may retrieve word variants: technology de regulation 1.3.3 crisis when communication cost data development _ aortic.*.