Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
tai cac » tai cuc
tai cau » tai cao
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
lieu ha » lieu nha, lieu va, liem ha
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky sang ((ma hoi) OR (mai hoi)). lieu ha nam thuc va hanh ((tai cau) or (tai cac)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ((ma hoi) OR (mai hoi)). lieu ha nam thuc va hanh ((tai cau) OR (tai cac)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang ((ma hoi) OR (mai hoi)). lieu ha nam thuc va hanh ((tai cau) or (tai cac)) tren".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ((ma hoi) OR (mai hoi)). lieu ha nam thuc va hanh ((tai cau) or (tai cac)) tren*.