Perhaps you should try some spelling variations:
technologies barriers » technological barriers, technologies varies, technology barriers
actions communication » actors communication, active communication, activists communication
barriers formulation » basic formulation, barriers irradiation, barriers location
formulation 3 » formulation _, formulations _, formulating _
pre actions » re actions, more actions, page actions
a areas » 1 areas, 2 areas, 4 areas
3 pre » _ pre, a pre, 2 pre

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

• Adding a wildcard symbol may retrieve word variants: technologies barriers formulation 3 pre actions communication costs _ development a areas.*.