Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
xac va » tac va, ac va, bac va
va cua » va chua, via cua, ca cua
cua te » cua tu
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: tu sach y nang x hoi. hieu va cam ((xac 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. hieu va cam ((xac va) OR (duc va)) hanh va cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu va cam ((xac va) or (duc va)) hanh va cua te*.