Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, diep quang
luan thong » luan phong, luan tuong, luat thong
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
thong van » trong van, thong va, thong quan
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan 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 ((hieu quang) or (hieu qua)) - hanh tang luan thong thong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu quang) OR (hieu qua)) - hanh tang luan thong thong van toan cao*.