Perhaps you should try some spelling variations:
thanh tung » thanh cong
khong cong » thong cong, khong cang, chong cong
hieu lang » chieu sang, hieu quang, nhieu tang
cua khong » hua khong, cua phuong, cua thuong
doi hieu » doi chieu, doc hieu, doi hien
tung cua » trung cua, tuong cua, dung cua
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, than cap
phan cac » nhan cach, phan dau, phan lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - thanh tung cua khong cong dan ((than cau) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh tung cua khong cong dan ((than cau) OR (phan cac)).
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - thanh tung cua khong cong dan ((than cau) or (phan cac))*.