Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
cong duong » cuong duong, cong dong, con duong
hieu lang » chieu sang, hieu quang, nhieu tang
duong dan » duong dang, huong dan, duong van
van nang » van quang, van ban, van dong
nang dua » nang du, nang suat, nang quan
dua cong » cua cong, qua cong, duc cong
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hop ((hieu lang) or (chieu sach)) - van nang dua cong duong dan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hop ((hieu lang) OR (chieu sach)) - van nang dua cong duong dan than cap*.