Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
phan hieu » van hieu, phan kien, gian hieu
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
hai hieu » hai chieu, hoi hieu, phap hieu
tan toan » tap toan, van toan, dan toan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hai hieu) OR (phan hieu)) lang - hanh trinh quan dung cong ((tan toan) OR (tan tran)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hai hieu) or (phan hieu)) lang - hanh trinh quan dung cong ((tan toan) OR (tan tran)) cau~".
• Adding a wildcard symbol may retrieve word variants: ((hai hieu) or (phan hieu)) lang - hanh trinh quan dung cong ((tan toan) OR (tan tran)) cau*.