Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
dinh vi » dinh ve, dinh viet, dinh tri
cua tre » cuu tre, cua triet, dua tren
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang ma hoa. hieu va cam xuc va ((dinh vi) or (chinh tri)) ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ma hoa. hieu va cam xuc va ((dinh vi) OR (chinh tri)) ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ma hoa. hieu va cam xuc va ((dinh vi) or (chinh tri)) ((cua tre) or (cua te))*.