Perhaps you should try some spelling variations:
secure communication » remote communication, science communication, mobile communication
technologies based » technologies used, technology based, technologies a
formative context » normative context, normative content, formation contents
based formative » based information
context since » context single, context some, context using
since secure » safe secure
4 developing » 3 developing
developing 1 » developing _, developing a, developing e
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technologies based formative context since secure communication costs 4 developing 1 africa.*.