Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
vu sach » vu bach, su sach, vu khach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
ve nam » he nam, va nam, le nam
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty ((nang xa) or (lang xa)) hoi. hieu ve nam thuc va hanh ((vi cua) or (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((nang xa) OR (lang xa)) hoi. hieu ve nam thuc va hanh ((vi cua) OR (vai cua)) te.
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((nang xa) or (lang xa)) hoi. hieu ve nam thuc va hanh ((vi cua) or (vai cua)) te*.