Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
cua triet » cua viet, su triet, va triet
tham soc » cham soc, tham nuoc, thai son
sang ma » tang ma, sang tao, mang may
va tham » van tham, va cham, va thanh
sach ky » sac ky, sach y, sach ty
danh vi » hanh vi, dinh vi, danh di
nang ma » tang ma, nang cao, mang may
so sach » so sanh, bo sach, co sach
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((nang ma) OR (sang ma)) hoi. lieu va tham soc va ((danh vi) or (trinh viet)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang ma) OR (sang ma)) hoi. lieu va tham soc va ((danh vi) OR (trinh viet)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((nang ma) OR (sang ma)) hoi. lieu va tham soc va ((danh vi) or (trinh viet)) cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang ma) OR (sang ma)) hoi. lieu va tham soc va ((danh vi) or (trinh viet)) cua triet*.