Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
cong tinh » cong trinh, cong vinh, long tinh
toan tap » toan ban
va cong » tai cong, cua cong
cong va » dong va, cong ha, cong tac

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 (hieu quang)) - va cong va nhung cong tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (hieu quang)) - va cong va nhung cong tinh toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (hieu quang)) - va cong va nhung cong tinh toan tap*.