Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
tam dung » tam duong, tac dung, tan dung
cong ban » cong bang, cong san, cong tan
ban nhan » ban than, van nhan, ban thanh
nhan cau » nhanh cau, phan cau, nhan sau
lien » bien, vien, tien

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 lang) or (((thieu quang) or (lien quan)))) - thanh trung tam dung cong ban nhan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (((thieu quang) OR (lien quan)))) - thanh trung tam dung cong ban nhan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (((thieu quang) or (lien quan)))) - thanh trung tam dung cong ban nhan cau*.