Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
cong thai » cong hai, hong thai, cong thanh
thai hang » thai hoang, thi hang, thai bang
hang cong » dang cong, hang nong, bang cong
van khang » van khanh, van thanh, van quang
hieu van » hieu va, thien van, lieu va
cong van » cong vang, cong san, song van
khang ca » hang ca, khang a, khang cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu van) or (chieu sach)) - thanh cong thai hang cong van khang ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu van) OR (chieu sach)) - thanh cong thai hang cong van khang ca.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu van) or (chieu sach)) - thanh cong thai hang cong van khang ca*.