Perhaps you should try some spelling variations:
sach ty » sach tu, sach thu, xach tay
hieu va » lieu va, hieu qua
hac duy » pham duy, phan duy
duy van » duy vat, dung van
minh di » minh ai, minh de, minh duc
cua tre » cua te, cuu tre, cua triet
va hac » van hac, va khac, va cac
di cua » dai cua, doi cua, de cua

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) or (sach y)) nang x ho. hieu va hac duy van minh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sach y)) nang x ho. hieu va hac duy van minh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) or (sach y)) nang x ho. hieu va hac duy van minh di cua tre*.