Perhaps you should try some spelling variations:
thuat tach » thuat sach, thuat mach, thuat tac
chiet tach » chieu sach
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
cua nhung » va nhung
ban thanh » ban hanh, ban hang
tung cua » trung cua, tuong cua, dung cua
ban than » van thanh, ban hang, ban hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thuat tach) or (chiet tach)) - thanh tung cua nhung cong ((ban than) or (ban thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuat tach) OR (chiet tach)) - thanh tung cua nhung cong ((ban than) OR (ban thanh)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thuat tach) or (chiet tach)) - thanh tung cua nhung cong ((ban than) or (ban thanh)) cau*.