Perhaps you should try some spelling variations:
khang cong » hang cong, thanh cong, phan cong
hieu lang » chieu sang, hieu quang, nhieu tang
thanh dam » thanh dat, thanh nam, thanh tam
dang cong » dung cong
hanh dam » hanh lam, hanh nam, hang dam
dan toan » van toan, dan than, manh toan
toan tap » toan ban
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - ((hanh dam) or (thanh dam)) van ((khang cong) OR (dang cong)) dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((hanh dam) OR (thanh dam)) van ((khang cong) OR (dang cong)) dan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((hanh dam) or (thanh dam)) van ((khang cong) OR (dang cong)) dan toan tap".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((hanh dam) or (thanh dam)) van ((khang cong) OR (dang cong)) dan toan tap*.