Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
trung quan » truong quan, trong quan, trung tuan
trong dong » trong cong, trong nong, trong dang
hoc chieu » hoc thieu, ho chieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
dong toan » dung toan, bong toan, cong toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sang - hanh ((trung quan) or (trung cua)) dung trong dong toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - hanh ((trung quan) OR (trung cua)) dung trong dong toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - hanh ((trung quan) or (trung cua)) dung trong dong toan ban*.