Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hoac khong » hoa khong, hoc khong, hay khong
khong cong » thong cong, khong cang, chong cong
hanh sinh » hanh tinh, hanh dinh, hinh sinh
sinh hoac » sinh hoc, sinh hoat, hinh hoc
phan chat » phan phat, phap chat, nhan chat
ngan nhat » ngan nam, nam nhat, tran nhat
ho chieu » theo chieu, hoc thieu, mot chieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - hanh sinh hoac khong cong ((phan chat) or (ngan nhat)) ran~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - hanh sinh hoac khong cong ((phan chat) OR (ngan nhat)) ran*.