Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thuat tac » thuat tach, thuat tao, thuat tai
cong cong » cong dong, trong cong, dung cong
anh dung » anh dong, anh huong, sach dung
dung cua » dung luan, dung cho
van than » van thanh, van thang, van tuan
van toan » van tuan, van tan, van thanh

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) or (thuat tac)) - anh dung cua cong cong ((van than) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat tac)) - anh dung cua cong cong ((van than) OR (van toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (thuat tac)) - anh dung cua cong cong ((van than) or (van toan)) cau*.