Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dua tren » dung tren
va cham » va tham
va chat » van chat, va phat, cao chat
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu ((va cham) OR (va chat)) xuc va hanh vi ((dua tren) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang x hoi. hieu ((va cham) OR (va chat)) xuc va hanh vi ((dua tren) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. hieu ((va cham) OR (va chat)) xuc va hanh vi ((dua tren) OR (cua te))*.