Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thach thuc » thuc thuc, thanh thuy, cach thuc
hoi chieu » doi chieu, ho chieu, hai chieu
van doanh » toan doanh, van dong, van thanh
doanh cua » doanh luan
phong van » thong van, phong va, hong van
cua dong » chua dong, cua cong, cua dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi chieu sang - van doanh cua dong ((phong van) or (phung van)) thach thuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi chieu sang - van doanh cua dong ((phong van) OR (phung van)) thach thuc.
• Adding a wildcard symbol may retrieve word variants: hoi chieu sang - van doanh cua dong ((phong van) or (phung van)) thach thuc*.