Perhaps you should try some spelling variations:
trinh chua » trinh chuan, trinh cua, trinh chu
hanh trinh » canh tranh, hanh chinh
chua bang » chu bang, chua nang, chua xang
cong sanh » cong danh, cong sach, cong thanh
chi xanh » chi anh, chi danh, chieu xanh
chi hanh » chi nhanh, chi thanh, thi hanh
cong san » cong tac
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: doi ((chi xanh) OR (chi hanh)) - hanh trinh chua bang ((cong sanh) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi xanh) OR (chi hanh)) - hanh trinh chua bang ((cong sanh) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi xanh) OR (chi hanh)) - hanh trinh chua bang ((cong sanh) or (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chi xanh) OR (chi hanh)) - hanh trinh chua bang ((cong sanh) or (cong san)) toan cao*.