Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
xuc va » tuc va, luc va, xac va
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: ((thu sach) or (te sach)) y nang x hoi. hieu va cac ((xuc va) or (duc va)) hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) y nang x hoi. hieu va cac ((xuc va) OR (duc va)) hanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) y nang x hoi. hieu va cac ((xuc va) or (duc va)) hanh dai cua te*.