Perhaps you should try some spelling variations:
hanh trong » hanh trang, anh trong, hinh trong
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
cac dung » cach dung, cac duong, tac dung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chinh sach) or (hieu lang)) - hanh trong cac dung cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (hieu lang)) - hanh trong cac dung cong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (hieu lang)) - hanh trong cac dung cong tac toan cao*.