Perhaps you should try some spelling variations:
dong duong » tuong duong, cuong duong, dong thong
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quan » hieu qua, lieu quan, thien quan
duong anh » duong manh, duong xanh, duong vanh
anh bang » anh hoang, anh quang, tinh bang
bang van » dang van, tang van, lang van
tuan tap » toan tap, tuan tai, tuyen tap

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 sang) or (hieu quan)) - anh bang van dong duong anh tuan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu quan)) - anh bang van dong duong anh tuan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu quan)) - anh bang van dong duong anh tuan tap*.