Perhaps you should try some spelling variations:
communication cross » communication costs
informational gaps » information gaps, information gap, informational _
developing karst » developing east, developing forest, developing heart
2 informational » _ informational, 8 informational, i informational
3 communication » 4 communication, de communication, data communication
technologies 2 » technologies _, technologies 4
3 developing » 3 development
karst areas » karstic areas, forest areas, thrust areas
guide 3 » guide _, guide a, guide 1
cross 3 » cross _, cross 1, cross c

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 informational gaps guide 3 communication cross 3 developing karst areas.*.