Perhaps you should try some spelling variations:
quan nhung » qua nhung, cua nhung, luan chung
luan nhung » luan chung, luan hung, luan phuong
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh mang » nhanh mang, hanh trang, nhanh lang
doc hieu » toc thieu, hoc thieu, hoc hien
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: doc hieu xanh - hanh mang ((luan nhung) or (quan nhung)) cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh mang ((luan nhung) OR (quan nhung)) cong tan toan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh mang ((luan nhung) or (quan nhung)) cong tan toan cau*.