Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tham nhung » thi nhung
nhung cong » dung cong, thong cong, hang cong
cong tham » chong tham, cong thai, hong tham
van khang » van khanh, van thanh, van quang
cong van » cong vang, cong san, song van
khang ca » hang ca, khang a, khang cu
hieu va » lieu va, hieu qua

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 va) or (chieu sach)) - thanh cong tham nhung cong van khang ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu va) OR (chieu sach)) - thanh cong tham nhung cong van khang ca.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu va) or (chieu sach)) - thanh cong tham nhung cong van khang ca*.