Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
trang cua » tranh cua, tang cua, trung cua
tang luan » dung luan
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban
ha tinh » va tinh, may tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu quang) or (ha tinh)) - hanh ((trang cua) or (tang luan)) nhung cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (ha tinh)) - hanh ((trang cua) OR (tang luan)) nhung cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) or (ha tinh)) - hanh ((trang cua) or (tang luan)) nhung cong san toan ban*.