Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
chieu sang » chieu sach, chieu xanh, nhieu tang
thanh tran » thanh trang, thanh toan, thanh tra
hieu lang » hieu quang, nhieu tang, hieu van
quan luat » quan luan, quan cua, quy luat
luat hinh » luat kinh
hinh cong » chinh cong, hinh chong, hanh cong
anh quan » anh tuan, ban quan, anh nhan
tran cau » tran chau, toan cau, ran cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (hieu lang)) - anh quan luat hinh cong thanh tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - anh quan luat hinh cong thanh tran cau.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - anh quan luat hinh cong thanh tran cau*.