Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van tham » van thanh, van tuan, van chat
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, 5 hoi

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 hoi) OR (x ho)). hieu ((va cham) or (van tham)) luc va hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ((x hoi) OR (x ho)). hieu ((va cham) OR (van tham)) luc va hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang ((x hoi) OR (x ho)). hieu ((va cham) or (van tham)) luc va hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ((x hoi) OR (x ho)). hieu ((va cham) or (van tham)) luc va hanh vi cua tu*.