Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh chat » tinh chat, trinh luat, trinh han
chat trong » nhat trong, thuat trong, chat luong
span chinh » hoan chinh, luan chinh, lan chinh
doi chieu » doc hieu, doi chi, mot chieu
cong span » cong san, long span, dong san
chinh can » chinh ca, chinh ban, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc thieu) or (doi chieu)) tinh - hanh trinh chat trong cong span chinh can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc thieu) OR (doi chieu)) tinh - hanh trinh chat trong cong span chinh can.
• Adding a wildcard symbol may retrieve word variants: ((toc thieu) or (doi chieu)) tinh - hanh trinh chat trong cong span chinh can*.