Perhaps you should try some spelling variations:
cong quang » luong quang, thong quang, duong quang
hieu lang » chieu sang, hieu quang, nhieu tang
hanh mang » nhanh mang, hanh trang, nhanh lang
mang suat » nang suat, cong suat, mang cua
cong nhan » cong nhat, cong thanh, cong san
toan cau » toan cao, toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh mang suat thong ((cong quang) or (cong nhan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh mang suat thong ((cong quang) OR (cong nhan)) toan cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh mang suat thong ((cong quang) or (cong nhan)) toan cau*.