Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va
va cua » va chua, via cua, ca cua
cua te » cua tu
x hoi » o hoi, x ho, 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: tu sach y nang ((x hoi) OR (xa hoi)). hieu ve cam ((xuc va) or (duc va)) hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (xa hoi)). hieu ve cam ((xuc va) OR (duc va)) hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) OR (xa hoi)). hieu ve cam ((xuc va) or (duc va)) hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) OR (xa hoi)). hieu ve cam ((xuc va) or (duc va)) hanh va cua te*.