Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
tung cap » trung cap, thong cap, trong cap
cung cap » trung cap
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cap » khan cap, thanh lap, thanh cac

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 ((hieu manh) OR (chiet tach)) - thanh ((tung cap) OR (cung cap)) dung cong tan than cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chiet tach)) - thanh ((tung cap) OR (cung cap)) dung cong tan than cap~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chiet tach)) - thanh ((tung cap) OR (cung cap)) dung cong tan than cap*.