Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
mot chieu » ho chieu
doi chieu » doc hieu, doi chi, ho chieu
trinh van » trinh han, trinh quan, dinh van
trong tac » trong cac, tuong tac, trong tan
tac tran » tan tran, tac trai, tac tren
tran tap » toan tap, tran tan, tran tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((mot chieu) or (doi chieu)) xanh - hanh ((trinh van) OR (trinh toan)) dung trong tac tran tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((mot chieu) OR (doi chieu)) xanh - hanh ((trinh van) OR (trinh toan)) dung trong tac tran tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mot chieu) or (doi chieu)) xanh - hanh ((trinh van) OR (trinh toan)) dung trong tac tran tap".
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (doi chieu)) xanh - hanh ((trinh van) OR (trinh toan)) dung trong tac tran tap*.