Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
dan thanh » dang thanh, danh thanh, ban thanh
nang cau » nang cao, hang cau, nang dau
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang cau hoi. ((hieu va) OR (hieu qua)) nam thuc dan thanh hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) nang cau hoi. ((hieu va) OR (hieu qua)) nam thuc dan thanh hai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) nang cau hoi. ((hieu va) OR (hieu qua)) nam thuc dan thanh hai cua tre*.