Perhaps you should try some spelling variations:
phuong dung » thong dung, cuong dung, phuong hoang
thiet tach » chiet tach, thien hach, thuat tach
thu phuong » thi phuong, thu huong, theo phuong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tranh thu » tran thu, thanh thu, thanh thuy
dung hanh » dung thanh, dang hanh, dung danh
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 thiet tach - canh tranh thu phuong dung hanh ((thanh van) or (thanh san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - canh tranh thu phuong dung hanh ((thanh van) OR (thanh san)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - canh tranh thu phuong dung hanh ((thanh van) or (thanh san))*.