Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
tang cong » tang cuong, trang cong, dang cong
doi hieu » doi chieu, doc hieu, doi hien
tung cao » nung cao, truong cao, trung cap
cao tang » cao dang
cong dan » cong san, cong tan, huong dan
chan cau » phan cau, can cau, chinh cau
chinh ca » chinh ta, chinh va, chinh tai

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 cao tang cong dan ((chan cau) or (chinh ca))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - thanh tung cao tang cong dan ((chan cau) OR (chinh ca))*.