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
nang ma » tang ma, sang ma, nang cao
va tham » van tham, va cham, va thanh
sach ky » sac ky, sach ty, sach kem
danh vi » hanh vi, dinh vi, danh di
ma hoi » mai hoi, xa hoi, ma hoa
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) OR (sach y)) nang 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) OR (sach y)) nang 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) OR (sach y)) nang 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) OR (sach y)) nang ma hoi. lieu va tham soc va ((danh vi) or (trinh viet)) cua triet*.