Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
thong cua » thong quan, thong tu, huong cua
tong cong » trong cong, cong cong, dung cong
dong cua » dung cua, cong cua, huong cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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: hoc hien xanh - thanh ((thong cua) or (dong cua)) tong cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - thanh ((thong cua) OR (dong cua)) tong cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - thanh ((thong cua) or (dong cua)) tong cong dan toan cau*.