Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hoc chieu » hoc thieu, ho chieu, hoc hien
tran dung » tran dang, tran hung, tran quang
dac thanh » dao thanh, duc thanh, bac thanh
thanh ban » thanh san, thanh van, thanh bac
dan dung » van dung, tin dung, ap dung
cong dac » cong tac, cong dan, cong cac

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 - thanh trung ((dan dung) or (tran dung)) cong dac thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sang - thanh trung ((dan dung) OR (tran dung)) cong dac thanh ban.
• Adding a wildcard symbol may retrieve word variants: hoc chieu sang - thanh trung ((dan dung) or (tran dung)) cong dac thanh ban*.