Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh via » hanh vi, hanh va, anh va
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
nang ma » tang ma, sang ma, mang may
cua tre » cua te, cuu tre, dua tren
va bao » va bai
bao bo » bac bo, ban bo, nao bo
bo van » vo van, so van, do van

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: so sanh ky ((nang ma) OR (nang cao)) hoi. lieu va bao bo van hanh via ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky ((nang ma) or (nang cao)) hoi. lieu va bao bo van hanh via ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: so sanh ky ((nang ma) or (nang cao)) hoi. lieu va bao bo van hanh via ((cua tre) OR (cua triet))*.