Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh hang » thanh hang, hang hang, hanh han
dung cong » dung trong
manh toan » thanh toan, anh tuan
hoi hieu » hoi phieu, hoi tieu, moi hieu
van tuan » van quan, van ban, anh tuan
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - hanh hang va dung cong ((tinh toan) or (((manh toan) or (van tuan)))) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - hanh hang va dung cong ((tinh toan) OR (((manh toan) OR (van tuan)))) cau.
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh hang va dung cong ((tinh toan) or (((manh toan) or (van tuan)))) cau*.