Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh thi » thanh tai, nhanh thi, thanh tri
cong cong » cong dong, trong cong, dung cong
cong tung » cong dung, cong hung, cong tang
thi cong » tai cong, thien cong
tung dan » dung dan, huong dan, trung dai
dan phan » doan phan, dan chan, van phan
phan lap » phan dau
hieu ca » hieu cac, hieu cua, hieu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sach) or (hieu ca)) - thanh thi cong cong tung dan phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sach) OR (hieu ca)) - thanh thi cong cong tung dan phan lap*.