Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
sach ty » sach tu, sach thu, xach tay
hac duy » pham duy, phan duy
duy van » duy vat, dung van
duc cua » doc cua, luc cua, tuc cua
cua tre » cua te, cuu tre, cua triet
minh » dinh

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 van) OR (thien van)) hac duy van minh duc 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 van) OR (thien van)) hac duy van minh duc cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ty) or (sach y)) nang x ho. ((hieu van) OR (thien van)) hac duy van minh duc cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) or (sach y)) nang x ho. ((hieu van) OR (thien van)) hac duy van minh duc cua tre*.