Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu nganh » vien nganh, hiem ngan, nghiep nganh
trinh than » trinh thanh, trinh han, trinh toan
hieu manh » chieu xanh, dieu hanh, hien hanh
dung cong » dung trong
trung co » trung bo, trong co, truong cao
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: doc ((hieu nganh) OR (hieu manh)) - thanh trung co ((dang cong) OR (dung cong)) trinh than cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu nganh) or (hieu manh)) - thanh trung co ((dang cong) OR (dung cong)) trinh than cap~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu nganh) or (hieu manh)) - thanh trung co ((dang cong) OR (dung cong)) trinh than cap*.