Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
manh tuong » manh tung, manh cuong, minh tuong
tuong dai » truong dai, tuong lai, duong dai
hong cong » thong cong, hoang cong, chong cong
dai hong » dai huong, dai cong, dai cuong
cong ban » cong bang, cong san, cong tan
ban toan » bai toan, ban than, van toan
toan cau » 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 ((chieu sang) or (chieu sach)) - manh tuong dai hong cong ban toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu sach)) - manh tuong dai hong cong ban toan cau*.