Perhaps you should try some spelling variations:
dau tien » van tien
hanh van » thanh van, khanh van, hanh va
sang tao » hang tai
cam thuc » am thuc, nam thuc, cam thu
hieu ve » hieu va, hieu van
sang ma » tang ma, mang may, sang tai
van dau » van dao, phan dau
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
nang ma » tang ma, nang cao, mang may
tu san » thu san, tu ban, tu can
ve cam » ve cham, ve cac, va cam
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky ((((sang ma) OR (sang tao))) or (nang ma)) hoi. hieu ve cam thuc va hanh van dau tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((((sang ma) OR (sang tao))) OR (nang ma)) hoi. hieu ve cam thuc va hanh van dau tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((((sang ma) OR (sang tao))) or (nang ma)) hoi. hieu ve cam thuc va hanh van dau tien".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((((sang ma) OR (sang tao))) or (nang ma)) hoi. hieu ve cam thuc va hanh van dau tien*.