Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hoc chieu » hoc thieu, ho chieu, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
van thanh » ban thanh, van tuan
trinh va » trinh van, trinh ve, trinh vi
van phan » van phong, luan phan, van ban

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