Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh mang
cua dong » chua dong, cua nong, cua song
cua dang » cua ban
cong tac » cong ty
tac tren » rac tren, tai tren, tap tren
tren cau » tren ca, tren cay, tren tau
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 tang ((((cua dong) OR (cua cong))) OR (cua dang)) cong tac tren cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh tang ((((cua dong) OR (cua cong))) or (cua dang)) cong tac tren cau~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh tang ((((cua dong) OR (cua cong))) or (cua dang)) cong tac tren cau*.