Perhaps you should try some spelling variations:
chung trung » chuong trung, chong trung, dung trung
chieu sang » chieu sach, chieu xanh, nhieu tang
luan chung » luan chinh
hieu lang » hieu quang, nhieu tang, hieu van
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
trung bai » trung dai, trung hai, trong bai
bai toan » bai tap
toan tap » toan 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 lang)) - hanh tang luan chung trung bai toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu lang)) - hanh tang luan chung trung bai toan tap*.