Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van tham » van thanh, van tuan, van chat
sach ky » sac ky, sach y, sach ty
va chat » van chat, va phat, cao chat
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua cu, cua te
cua su » qua su
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 ky nang x hoi. hieu ((va chat) or (van tham)) luc va hanh vi ((cua tu) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang x hoi. hieu ((va chat) OR (van tham)) luc va hanh vi ((cua tu) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x hoi. hieu ((va chat) or (van tham)) luc va hanh vi ((cua tu) or (cua su))*.