Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
lai cua » dai cua, hai cua, lai chau
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
va cao » va cac, va co, va dao
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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) or (lang ha)) hoi. hieu va cao ((xuc va) or (tuc va)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang x) OR (lang ha)) hoi. hieu va cao ((xuc va) OR (tuc va)) hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang x) or (lang ha)) hoi. hieu va cao ((xuc va) or (tuc va)) hanh lai cua tre*.