Perhaps you should try some spelling variations:
nhung duong » nhung dung, nhung huong, nhung tuong
duong thanh » dong thanh, muong thanh, luong thanh
thien hach » thien thanh, hien hanh
thuat mach » thuat sach, thuat tach, thuyet mach
thanh tung » thanh cong
thanh toan » thanh hoa, thanh san, tinh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien hach) or (thuat mach)) - ((thanh trung) OR (thanh tung)) va nhung duong thanh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (thuat mach)) - ((thanh trung) OR (thanh tung)) va nhung duong thanh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien hach) or (thuat mach)) - ((thanh trung) OR (thanh tung)) va nhung duong thanh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (thuat mach)) - ((thanh trung) OR (thanh tung)) va nhung duong thanh toan ban*.