Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
cong tham » chong tham, cong thai, hong tham
tham lang » nham nang, pham hang, thai bang
lang cong » dang cong, bang cong, hang cong
van thang » van thanh, van khang, van hang
cong van » cong vang, cong san, song van
thang ca » thang cua, hang ca, tang ca
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 lang cong van thang ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu va) OR (chieu sach)) - thanh cong tham lang cong van thang ca.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu va) or (chieu sach)) - thanh cong tham lang cong van thang ca*.