Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung quang » truong quang, trong quang, trung quan
chieu sang » chieu xanh, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
quang dung » quang trung, ung dung, cuong dung
hieu lang » hieu quang, nhieu tang, hieu van
dung cong » dung trong
cong ban » cong bang, cong san, cong tan
ban phan » ban phap, van phan, ban than
phan cau » phan dau, phan cac, phan tu

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 (((chieu sach) OR (chieu sang)))) - thanh trung quang dung cong ban phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (((chieu sach) OR (chieu sang)))) - thanh trung quang dung cong ban phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) or (((chieu sach) OR (chieu sang)))) - thanh trung quang dung cong ban phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (((chieu sach) OR (chieu sang)))) - thanh trung quang dung cong ban phan cau*.