Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thu sach » tu sach, thuat sach, thuoc sach
hanh noi » ha noi, nang noi
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty danh » ty doanh, ky danh, te danh
cu tren » tu tren, dua tren
ty anh » ly anh, thuy anh

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ty danh) OR (ty anh)) mai hoi. hieu ve cham thuc va ((hanh noi) or (hanh vi)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty danh) OR (ty anh)) mai hoi. hieu ve cham thuc va ((hanh noi) OR (hanh vi)) cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty danh) OR (ty anh)) mai hoi. hieu ve cham thuc va ((hanh noi) or (hanh vi)) cu tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty danh) OR (ty anh)) mai hoi. hieu ve cham thuc va ((hanh noi) or (hanh vi)) cu tren*.