Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
sach duy » sach dung, sach duoc, sach dao
tu sach » thu sach, su sach, te sach
lai cua » dai cua, hai cua, lai chau
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
duy van » duy vat, dung van
cua tre » cua te, cuu tre, cua triet
soc va » loc va, doc va, goc 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 duy van ((mai hoi) or (ma hoa)). hieu ve cham ((soc va) or (hoc va)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach duy van ((mai hoi) OR (ma hoa)). hieu ve cham ((soc va) OR (hoc va)) hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach duy van ((mai hoi) or (ma hoa)). hieu ve cham ((soc va) or (hoc va)) hanh lai cua tre*.