Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trung » thanh trung, hanh trang, manh trung
hoc chieu » hoc thieu, ho chieu, hoc hien
trung va » truong va, trang va, trung ha
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cao » toan ban, toan 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 - hanh trung va nhung ((((cong tan) OR (cong tac))) or (cong trinh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - hanh trung va nhung ((((cong tan) OR (cong tac))) OR (cong trinh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - hanh trung va nhung ((((cong tan) OR (cong tac))) or (cong trinh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - hanh trung va nhung ((((cong tan) OR (cong tac))) or (cong trinh)) toan cao*.