Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu sach » hieu cach, dien sach, hieu cac
thanh hoi » thanh hoai, thanh hoa, thanh hai
nang cong » nang song, dang cong, bang cong
cong dung » cuong dung, cong dong, cong luong
hoi nang » hoi lang, ho nang, hoa nang
dung dat » dung va, dung tai
dat phan » data phan, dam phan, sat phan
phan lap » phan dau

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

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