Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
thuc va » thuc vat, thuc dan, thuc day
van lam » van nam
ky danh » ky anh
ky dang » ky nang
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc 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) or (ky danh)) xa hoi. hieu van lam ((xuc va) or (thuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky dang) OR (ky danh)) xa hoi. hieu van lam ((xuc va) OR (thuc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ((ky dang) or (ky danh)) xa hoi. hieu van lam ((xuc va) or (thuc va)) hanh vi cua tre*.