Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh trung » thanh trung, hanh trang, manh trung
trung cua » truong cua, trung tuan, trung cap
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
van thanh » ban thanh, van tuan
thanh cha » thanh ha, thanh nha, thanh phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (hieu nganh)) - hanh trung cua ((hang cong) OR (dang cong)) van thanh cha~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (hieu nganh)) - hanh trung cua ((hang cong) OR (dang cong)) van thanh cha.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (hieu nganh)) - hanh trung cua ((hang cong) OR (dang cong)) van thanh cha".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (hieu nganh)) - hanh trung cua ((hang cong) OR (dang cong)) van thanh cha*.