Perhaps you should try some spelling variations:
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
qua dung » quang dung, su dung, qua song
cua dong » chua dong, cua cong, cua dang
cong tac » cong ty
tac giam » tac gia, tac giai, tac pham
giam cua » gian cua, gia cua, giau cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - cach mang ((qua dung) or (cua dong)) cong tac giam cua~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - cach mang ((qua dung) OR (cua dong)) cong tac giam cua.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - cach mang ((qua dung) or (cua dong)) cong tac giam cua*.