Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
hieu ve » hieu va, hieu van
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
dinh cu » dinh cuu, dinh chuc, dinh chau
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, 5 hoi
cu va » cuu va, tu va, su va

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 y nang ((x hoi) OR (x ho)). hieu ve cam ((xuc van) or (duc van)) dinh cu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((x hoi) OR (x ho)). hieu ve cam ((xuc van) OR (duc van)) dinh cu va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((x hoi) OR (x ho)). hieu ve cam ((xuc van) or (duc van)) dinh cu va triet".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((x hoi) OR (x ho)). hieu ve cam ((xuc van) or (duc van)) dinh cu va triet*.