Perhaps you should try some spelling variations:
nang hai » hang hai, nang tai, dang hai
nam thuc » nam thuoc, am thuc, nam thu
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
nang ha » nang han, nang hoa, lang ha
san ky » sang ky, van ky, dan ky
ve nam » he nam, va nam, le nam
vi cua » di cua
tu san » thu san, tu ban, tu can

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: tu san ky ((nang ha) OR (nang hai)) hoi. hieu ve nam thuc va hanh ((vi cua) OR (vai cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((nang ha) OR (nang hai)) hoi. hieu ve nam thuc va hanh ((vi cua) or (vai cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((nang ha) OR (nang hai)) hoi. hieu ve nam thuc va hanh ((vi cua) or (vai cua)) triet*.