Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
dung cong » dung trong
mang cua » manh cua, dung cua, ban cua
thong tu » phong tuc, thong tin, thong ke
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sang) or (hieu quang)) - hanh ((mang cua) or (thong tu)) dung cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu quang)) - hanh ((mang cua) OR (thong tu)) dung cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) or (hieu quang)) - hanh ((mang cua) or (thong tu)) dung cong san toan ban*.