Perhaps you should try some spelling variations:
khong cong » thong cong, khong cang, khong con
chong cong » cong cong, thong cong, cuong cong
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh ban » thanh ban, hang ban, hanh san
tan toan » tan tran, tap toan, van toan
toan ban » van ban
ban cua » ban quan

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 ban cua ((khong cong) or (chong cong)) tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh ban cua ((khong cong) OR (chong cong)) tan toan ban*.