Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
xac va » tac va, ac va, bac 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 y nang ma hoa. hieu va cam ((((xuc va) or (xac va))) or (thuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ma hoa. hieu va cam ((((xuc va) OR (xac va))) OR (thuc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach y nang ma hoa. hieu va cam ((((xuc va) or (xac va))) or (thuc va)) hanh vi cua tre*.