Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
minh de » menh de, minh ve, sinh de
minh di » minh ai, minh duc, minh tri
duy van » duy vat, dung van
hac duy » pham duy, phan duy
sach ty » sach y, sach thu, xach tay
van hac » van hoc, van ha, van hai
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet

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 tu)) nang x ho. hieu van hac duy van ((minh di) or (minh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sach tu)) nang x ho. hieu van hac duy van ((minh di) OR (minh de)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ty) OR (sach tu)) nang x ho. hieu van hac duy van ((minh di) or (minh de)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) OR (sach tu)) nang x ho. hieu van hac duy van ((minh di) or (minh de)) cua tre*.