Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
lao va » tao va, cao va, bao va
le va » le van, te va, ly 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 ((ty nang) or (ky nang)) xa hoi. hieu va cac ((le va) or (lao va)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ky nang)) xa hoi. hieu va cac ((le va) OR (lao va)) hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ky nang)) xa hoi. hieu va cac ((le va) or (lao va)) hanh lai cua tre*.