Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
phan hieu » phan kien, gian hieu, phan bien
luat dung » suat dung, luat chung, luat quang
dung cong » dung trong
hai hieu » hai chieu, hoi hieu, phap hieu
van hieu » cao hieu
cong san » cong tac
san tran » tan tran, ban tran, dang tran
tran cau » tran chau, toan cau, ran cau

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: ((hai hieu) OR (((phan hieu) OR (van hieu)))) lang - hanh trinh luat dung cong san tran cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hai hieu) or (((phan hieu) OR (van hieu)))) lang - hanh trinh luat dung cong san tran cau~".
• Adding a wildcard symbol may retrieve word variants: ((hai hieu) or (((phan hieu) OR (van hieu)))) lang - hanh trinh luat dung cong san tran cau*.