Perhaps you should try some spelling variations:
hanh trinh » canh tranh
dung cong » dung trong
cong toan » cong tan, cong hoan, cong tuan
toan phan » thanh phan, toan ban, hoa phan
hoi hieu » hoi phieu, hoi tieu, moi hieu
phan cau » phan dau, phan cac, phan tu
ho hieu » ho chieu, nho hieu, co hieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (hoi hieu)) quang - ((hanh trinh) OR (hanh chinh)) ung dung cong toan phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) OR (hoi hieu)) quang - ((hanh trinh) or (hanh chinh)) ung dung cong toan phan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) OR (hoi hieu)) quang - ((hanh trinh) or (hanh chinh)) ung dung cong toan phan cau*.