Perhaps you should try some spelling variations:
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh phan » thanh phan, anh phan, hanh han
dang cong » dung cong
phan cua » nhan cua, than cua, phat cua
cua dang » cua cong, cua ban
dan than » dan chan, ban than, van than

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 - hanh phan cua dang cong ((dan than) or (tinh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh phan cua dang cong ((dan than) OR (tinh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh phan cua dang cong ((dan than) or (tinh toan)) cau*.