Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh trung » thanh trung, hanh trang, manh trung
trung cao » truong cao, trung cap, trung co
cao phan » co phan, cho phan, cac phan
cong san » cong tac
cong tan » cong tac, cong thanh, cong ty
phan tap » phan lap, han tap, pha tap

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 (chiet tach)) - hanh trung cao phan ((cong san) or (cong tan)) phan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh trung cao phan ((cong san) OR (cong tan)) phan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chiet tach)) - hanh trung cao phan ((cong san) or (cong tan)) phan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chiet tach)) - hanh trung cao phan ((cong san) or (cong tan)) phan tap*.