Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hoc thieu » toc thieu, hoc hien
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cong manh » cong danh, duong manh, hoang manh
doc hieu » toc thieu, hoc hien
tinh cua » trinh cua, sinh cua, tinh chat
cua dung » cua dang, cua dong, qua dung
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (hoc thieu)) xanh - hanh tinh cua dung ((cong manh) OR (cong thanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc thieu)) xanh - hanh tinh cua dung ((cong manh) OR (cong thanh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (hoc thieu)) xanh - hanh tinh cua dung ((cong manh) OR (cong thanh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc thieu)) xanh - hanh tinh cua dung ((cong manh) OR (cong thanh)) toan cau*.