Perhaps you should try some spelling variations:
communication section » communication sector, communication collection, communication security
technologies basic » technologies based, technologies bit, technologies big
basic formulation » basic population, bayesian formulation, policy formulation
db communication » de communication, debt communication, job communication
development pan » development plan, development plans, development japan
formulation g » formulation _, formulation 3, formulation 4
3 development » 2 development
pan african » pan american, can africa, pan africanism
section 3 » section 1, section 2
20 db » 20 de, 50 db
g 20 » _ 20

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

• Adding a wildcard symbol may retrieve word variants: technologies basic formulation g 20 db communication section 3 development pan african.*.