Perhaps you should try some spelling variations:
thuyet mach » thuyet xac, thuyet cac, thuyet anh
phuong dang » phuong dung, phuong dong, huong dang
hoc thuyet » hoc chuyen
thu phuong » thi phuong, thu huong, theo phuong
tranh thu » tran thu, thanh thu, thanh thuy
dang hanh » dang thanh, ban hanh, dang van
thanh van » thanh toan, thanh phan, thanh nhan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuyet mach - canh tranh thu phuong dang hanh ((thanh van) or (thanh san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thuyet mach - canh tranh thu phuong dang hanh ((thanh van) OR (thanh san)).
• Adding a wildcard symbol may retrieve word variants: hoc thuyet mach - canh tranh thu phuong dang hanh ((thanh van) or (thanh san))*.