Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
hieu lang » chieu sang, hieu quang, nhieu tang
hanh hang » thanh hang, hang hang, hanh mang
thanh cau » thanh chau, thanh mau, nhanh cau
hanh han » hanh nhan, hanh phan, hanh san
va thong » va thuong, va phuong, he thong
cong tan » cong tac, cong san, cong ty
ho hieu » ho chieu, hoi hieu, nho hieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((hanh hang) OR (hanh han)) va thong ((cong tan) OR (cong thanh)) thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((hanh hang) or (hanh han)) va thong ((cong tan) OR (cong thanh)) thanh cau~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((hanh hang) or (hanh han)) va thong ((cong tan) OR (cong thanh)) thanh cau*.