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