Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mang xa » mang may, dang xay, mang cua
lang xa » lang ha, dang xay, lang van
di cua » doi cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((mang xa) or (lang xa)) hoi. hieu van nam thuc van hanh ((di cua) OR (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((mang xa) OR (lang xa)) hoi. hieu van nam thuc van hanh ((di cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((mang xa) or (lang xa)) hoi. hieu van nam thuc van hanh ((di cua) OR (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang xa) or (lang xa)) hoi. hieu van nam thuc van hanh ((di cua) OR (dai cua)) te*.