Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
dung cua » dung luan, dung cho
than cao » thai cao, than cap, than sao
toan cao » toan ban, toan tap
ha dung » hai dung, kha dung, nha 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 - ha dung cua ((nhung cong) or (dung cong)) dan ((than cao) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ha dung cua ((nhung cong) OR (dung cong)) dan ((than cao) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ha dung cua ((nhung cong) or (dung cong)) dan ((than cao) or (toan cao))*.