Perhaps you should try some spelling variations:
"gas resource developing countries problems." » "gas resources developing countries problems.", "gas resource development countries problems.", "gas research developing countries problems.", "a resource developing countries problems."
"web act developed countries programs." » "web act developed countries program.", "web act developed country programs.", "web act developed country program.", "web a developed countries programs.", "web ce developed countries programs.", "web least developed countries programs."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("gas resource developing countries problems.") OR ("web act developed countries programs."))~.
• Removing quotes may allow a broader search: (( gas resource developing countries problems. ) or ( web act developed countries programs. ))~.
• Adding a wildcard symbol may retrieve word variants: (("gas resource developing countries problems.") or ("web act developed countries programs."))*.