Perhaps you should try some spelling variations:
tong cong » trong cong, cong cong, dung cong
doc hieu » toc thieu, hoc thieu
tranh ha » thanh ha, trang ha, trinh ha
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac
ha tong » han tong, ha dong, ha tang

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 hien)) xanh - canh tranh ha tong cong dan ((than cau) OR (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) xanh - canh tranh ha tong cong dan ((than cau) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (hoc hien)) xanh - canh tranh ha tong cong dan ((than cau) OR (than cap))".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc hien)) xanh - canh tranh ha tong cong dan ((than cau) OR (than cap))*.