Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh vai » thanh hai, thanh van, thanh tai
cham thuc » nham thuc, pham thuc, tham thuc
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
so sach » so sanh, bo sach, co sach
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((thu nang) or (thu hang)) ma hoi. ((hieu va) OR (hieu qua)) cham thuc vat thanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thu nang) OR (thu hang)) ma hoi. ((hieu va) OR (hieu qua)) cham thuc vat thanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((thu nang) or (thu hang)) ma hoi. ((hieu va) OR (hieu qua)) cham thuc vat thanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ((thu nang) or (thu hang)) ma hoi. ((hieu va) OR (hieu qua)) cham thuc vat thanh vai cua te*.