Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh tai, hanh van
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
tham soc » cham soc, tham nuoc, thai son
cua tre » cua te, cuu tre, cua triet
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
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 y nang ma hoi. hieu van tham soc va ((hanh vai) or (hanh va)) ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu van tham soc va ((hanh vai) OR (hanh va)) ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu van tham soc va ((hanh vai) or (hanh va)) ((cua tre) or (su triet))*.