Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
quan nhung » qua nhung, cua nhung, luan chung
hieu lang » chieu sang, hieu quang, nhieu tang
qua chung » qua chuong, quat chung, cua chung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh trung ((quan nhung) or (qua chung)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh trung ((quan nhung) OR (qua chung)) cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh trung ((quan nhung) or (qua chung)) cong tac toan cau*.