Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trung chan » trung phan, trong chan, trung nhan
dung huong » dung thuong, dung phuong, dong huong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung can » trung cap, trung van, trong can
dan than » dan chan, ban than, van 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 (chieu sach)) - thanh ((trung chan) OR (trung can)) dung huong dan than cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chieu sach)) - thanh ((trung chan) OR (trung can)) dung huong dan than cap~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu sach)) - thanh ((trung chan) OR (trung can)) dung huong dan than cap*.