Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
khong mong » khong dong, khong xuong, khong trong
hieu lang » chieu sang, hieu quang, nhieu tang
van doanh » toan doanh, van dong, van thanh
doanh hay » doan hay, doanh ha, doanh nhan
hay khong » bay khong, hang khong, hoac khong
mong van » muong van, song van, tong van
van tan » van tuan, van ban, van tai
tan tap » toan tap, han tap, tan tat

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (hieu lang)) - van doanh hay khong mong van tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (hieu lang)) - van doanh hay khong mong van tan tap.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (hieu lang)) - van doanh hay khong mong van tan tap*.