Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cua triet, dua tren
hanh va » hang va
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hau xuc » chat xuc
van hau » van ha, van hai, van dau
nang ma » tang ma, sang ma, nang cao
cuu tre » cau tren, cau treo
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 nang ma hoi. hieu van hau xuc ban ((hanh vi) or (hanh va)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu van hau xuc ban ((hanh vi) OR (hanh va)) ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu van hau xuc ban ((hanh vi) or (hanh va)) ((cua tre) or (cuu tre))*.