Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
hai cua » thai cua, hoi cua, lai cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
mang xa » mang may, dang xay, mang cua
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam

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 ((mang xa) OR (lang xa)) hoi. hieu ve nam thuc dan thanh ((hai cua) OR (dai cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((mang xa) or (lang xa)) hoi. hieu ve nam thuc dan thanh ((hai cua) OR (dai cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((mang xa) or (lang xa)) hoi. hieu ve nam thuc dan thanh ((hai cua) OR (dai cua)) triet*.