Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
ho chieu » theo chieu, hoc thieu, doi chieu
quan ban » quang ban, qua ban, quan van
ban cong » bang cong, van cong, phan cong
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan
ho hieu » hoi hieu, nho hieu, co hieu

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: ((ho hieu) OR (ho chieu)) lang - hanh trinh quan ban cong ((tac toan) OR (tam toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) or (ho chieu)) lang - hanh trinh quan ban cong ((tac toan) OR (tam toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (ho chieu)) lang - hanh trinh quan ban cong ((tac toan) OR (tam toan)) cau*.