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
tuc va » thuc va, truc va, tuc xa
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)) tuc va hanh vi ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x hoi. hieu ((va cham) OR (va chat)) tuc 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)) tuc va hanh vi ((dua tren) or (cua te))*.