Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
cong dung » cuong dung, cong dong, cong luong
van cong » van dong, van phong, phan cong
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 van » dao van, vo van, so van

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