Perhaps you should try some spelling variations:
khang cong » hang cong, thanh cong, dang cong
hieu lang » chieu sang, hieu quang, nhieu tang
thanh dam » thanh dat, thanh nam, thanh tam
van khang » van khanh, van thanh, van quang
hanh dam » hanh lam, hanh nam, hang dam
cong dan » cong san, cong tan, huong dan
toan ban » van ban
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 dam) OR (thanh dam)) van khang cong dan ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((hanh dam) or (thanh dam)) van khang cong dan ((toan tap) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((hanh dam) or (thanh dam)) van khang cong dan ((toan tap) OR (toan ban))*.