Perhaps you should try some spelling variations:
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
mang cua » manh cua, dung cua, ban cua
cua dang » cua cong, cua ban
cong tan » cong tac, cong san, cong thanh
gian cua » gian xu, ban cua
gian tu » gian xu, gian thua, gian tay

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 cua dang cong tan ((gian tu) or (gian cua))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - cach mang cua dang cong tan ((gian tu) OR (gian cua)).
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - cach mang cua dang cong tan ((gian tu) or (gian cua))*.