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
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
cu tren » tu tren, 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 x ho. hieu va cam xuc va hanh vi ((((cua tre) OR (cua te))) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang x ho. hieu va cam xuc va hanh vi ((((cua tre) OR (cua te))) OR (cu tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang x ho. hieu va cam xuc va hanh vi ((((cua tre) OR (cua te))) or (cu tren))*".