Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
van lam » van nam
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va
vi cua » vai cua, di cua

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 dang xa hoi. hieu van lam ((xuc va) or (((duc va) or (thuc vat)))) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang xa hoi. hieu van lam ((xuc va) OR (((duc va) OR (thuc vat)))) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky dang xa hoi. hieu van lam ((xuc va) or (((duc va) or (thuc vat)))) hanh vi cua tre*.