Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh dung » thanh duong, thanh tung, thanh hung
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
dung hoc » dong hoc, dung thuoc, trung hoc
hoc dung » hoc ung, hoc dan, tac dung
cong tan » cong tac, cong san, cong thanh
tan hang » tan khang, ban hang, van hang
hang ca » hang va, nang cao, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (chieu xanh)) - thanh dung hoc dung cong tan hang ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (chieu xanh)) - thanh dung hoc dung cong tan hang ca.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (chieu xanh)) - thanh dung hoc dung cong tan hang ca*.