Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
den thanh » de thanh, dinh thanh, dong thanh
hanh mang » nhanh mang, hanh trang, nhanh lang
mang luan » tang luan, hang luan, bang luan
luan cong » luat cong, luong cong, luan chung
cong cong » cong dong, trong cong, dung cong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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) or (den thanh)) - hanh mang luan cong cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (den thanh)) - hanh mang luan cong cong tan toan cau*.