Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
cong dung » cuong dung, cong dong, cong luong
dan cong » dang cong, van cong, dan dong
dung dat » dung va, dung tai
dat phan » data phan, dam phan, sat phan
phan lap » phan dau
hieu ca » hieu cac, hieu cua, hieu va
thai do » thay doi, thai den
do dan » do danh, dao dan, do dang

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)) - thai do dan cong dung dat phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sach) OR (hieu ca)) - thai do dan cong dung dat phan lap*.