Perhaps you should try some spelling variations:
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
quang cua » quan cua, quang tuan, quang huy
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
toan cao » toan ban
toan tap » toan 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 ((thieu sang) or (chieu sang)) - nhanh quang cua dung cong tan ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sang)) - nhanh quang cua dung cong tan ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu sang)) - nhanh quang cua dung cong tan ((toan cao) or (toan tap))*.