Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhanh cong » nhanh chong, thanh cong, nganh cong
hang cong » dang cong, hang nong, bang cong
van thang » van thanh, van khang, van hang
hieu van » hieu va, thien van, lieu va
cong thi » cong thai, cong khi, dong thi
thi hang » thi hanh, thi nang, thi hong
cong van » cong vang, cong san, song van
thang ca » thang cua, hang ca, tang ca

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