Perhaps you should try some spelling variations:
chat trong » nhat trong, thuat trong, chat luong
trong long » trong luong, truong long, trong cong
span chinh » hoan chinh, luan chinh, lan chinh
doi chieu » doc hieu, doi chi, mot chieu
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
long span » cong san, dong san, nong 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 tinh chat trong long span chinh can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc thieu) OR (doi chieu)) tinh - hanh tinh chat trong long span chinh can.
• Adding a wildcard symbol may retrieve word variants: ((toc thieu) or (doi chieu)) tinh - hanh tinh chat trong long span chinh can*.