Perhaps you should try some spelling variations:
thanh thong » thanh thuong, thanh hong, thanh thang
chieu sang » chieu sach, chieu xanh, hieu lang
dung cong » dung trong
hieu van » hieu va, thien van, lieu va
thong tu » phong tuc, thong tin, thong ke
cong tan » cong tac, cong san, cong thanh
tan khan » tan khang, tan nhan, toan khoan
khan cap » khan ap, than cap, khoan cam
tu dung » tuc dung, tu duong, su dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) or (hieu van)) - thanh thong tu dung cong tan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu van)) - thanh thong tu dung cong tan khan cap.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu van)) - thanh thong tu dung cong tan khan cap*.