Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
lai cua » dai cua, hai cua, lai chau
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
xac va » tac va, ac va, bac va
luc va » duc va, tuc va, loc va

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 xa) or (lang xa)) hoi. hieu va cam ((xac va) or (luc va)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (lang xa)) hoi. hieu va cam ((xac va) OR (luc va)) hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (lang xa)) hoi. hieu va cam ((xac va) or (luc va)) hanh lai cua tre*.