Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van cham » van chat, van tham, va cham
cua viet » ca viet, hoa viet, cua vat
hanh vii » hanh voi, hanh va, hanh noi
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
soc va » hoc va, loc va, doc va
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky tang ma hoi. hieu van cham soc va ((hanh vii) or (hanh vi)) ((cua viet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang ma hoi. hieu van cham soc va ((hanh vii) OR (hanh vi)) ((cua viet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang ma hoi. hieu van cham soc va ((hanh vii) or (hanh vi)) ((cua viet) or (su triet))*.