Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu quang » thieu quang, hieu quan, hieu qua
dung cong » dung trong
anh hang » anh hoang, anh hung, anh bang
hang tai » hang va, dung tai
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: hoc ((chieu xanh) or (hieu quang)) - anh hang tai ((dang cong) or (dung cong)) san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (hieu quang)) - anh hang tai ((dang cong) OR (dung cong)) san toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (hieu quang)) - anh hang tai ((dang cong) or (dung cong)) san toan ban*.