Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
va cham » va chat
sach ty » sach y, sach tu, sach thu
va tham » van tham, va thanh, va thuat
ty nang » ky nang, ty xang, ty hang
dau cua » dai cua, day cua, cau cua
cua cua » cua chua, ca cua, qua cua
luc va » duc va, tuc va, loc va
va dau » va dao
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: thu sach ty nang ((x hoi) or (x ho)). hieu ((va cham) OR (va tham)) luc va dau cua cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((x hoi) OR (x ho)). hieu ((va cham) OR (va tham)) luc va dau cua cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang ((x hoi) or (x ho)). hieu ((va cham) OR (va tham)) luc va dau cua cua viet*".