Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh tang » hanh trang, anh tang, hanh mang
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van
toan ban » van ban
tang va » trang va, tang van, thang va
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((thuc hanh) or (chieu sach)) - hanh tang va hang ((cong van) OR (song van)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((thuc hanh) OR (chieu sach)) - hanh tang va hang ((cong van) OR (song van)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((thuc hanh) or (chieu sach)) - hanh tang va hang ((cong van) OR (song van)) toan ban".
• Adding a wildcard symbol may retrieve word variants: theo ((thuc hanh) or (chieu sach)) - hanh tang va hang ((cong van) OR (song van)) toan ban*.