Perhaps you should try some spelling variations:
hanh trinh » canh tranh
doi chieu » doi chi, ho chieu, mot chieu
quan hanh » quan thanh, quang thanh, quang khanh
hanh cong » thanh cong, hang cong, hanh dong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doc hieu)) tinh - ((hanh trinh) or (hanh chinh)) quan hanh cong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) tinh - ((hanh trinh) OR (hanh chinh)) quan hanh cong dan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) tinh - ((hanh trinh) or (hanh chinh)) quan hanh cong dan phan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) tinh - ((hanh trinh) or (hanh chinh)) quan hanh cong dan phan cau*.