Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
mot chieu » ho chieu
doi chieu » doc hieu, doi chi, ho chieu
tuc dung » thuc dung, tac dung, duc dung
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau
tu dung » tu duong, su dung, tu vung

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: ((mot chieu) OR (doi chieu)) tinh - hanh trinh ((tu dung) OR (tuc dung)) cong dan chan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mot chieu) or (doi chieu)) tinh - hanh trinh ((tu dung) OR (tuc dung)) cong dan chan cau~".
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (doi chieu)) tinh - hanh trinh ((tu dung) OR (tuc dung)) cong dan chan cau*.