Perhaps you should try some spelling variations:
thiet tach » thien hach, thuat tach
chiet tach » chieu sach
hanh trung » thanh trung, hanh trang, manh trung
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong tac » cong ty
than cau » toan cau, phan cau, than cap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((thiet tach) OR (chiet tach)) - hanh trung cua nhung ((cong san) OR (cong tac)) than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((thiet tach) or (chiet tach)) - hanh trung cua nhung ((cong san) OR (cong tac)) than cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((thiet tach) or (chiet tach)) - hanh trung cua nhung ((cong san) OR (cong tac)) than cau*.