Perhaps you should try some spelling variations:
technologies barriers » technological barriers, technologies varies, technology barriers
barriers formulation » basic formulation, barriers irradiation, barriers location
active communication » reactive communication, proactive communication, actions communication
formulation a » formulation _, formulation 3, formulation 4
pre active » pro active, more active, de active
a areas » 1 areas, 2 areas, 4 areas
a pre » _ 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 a pre active communication costs _ development a areas.*.