Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
cong pham » cong phan, chong phap, cong ha
pham hang » pham hoang, pham hong, pham hanh
hang cong » dang cong, hang nong, bang cong
van thanh » ban thanh, van tuan
thanh dat » thanh san, thanh hai, thanh van
hieu van » hieu va, thien van, lieu va
cong van » cong vang, cong san, song van

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