Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hieu lang » chieu sang, hieu quang, nhieu tang
cach dung » sach dung, cach mang, tac dung
cac dung » cac duong, tac dung, cac dang
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 trang ((cac dung) OR (cach 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 trang ((cac dung) OR (cach dung)) cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chinh sach) or (hieu lang)) - hanh trang ((cac dung) OR (cach dung)) cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (hieu lang)) - hanh trang ((cac dung) OR (cach dung)) cong tac toan cao*.