Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
vai cua » dai cua, hai cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
ve tham » va tham, ve cham, vi tham
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
tu cai » tu cac, tu can, tu bai
va dan » ca dan, va dao, va dau
vi cua » di cua
tu sai » tu bai, tu san, tu lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sai) or (tu cai)) ky sang ma hoi. hieu ve tham thuc va dan ((vi cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sai) OR (tu cai)) ky sang ma hoi. hieu ve tham thuc va dan ((vi cua) OR (vai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sai) or (tu cai)) ky sang ma hoi. hieu ve tham thuc va dan ((vi cua) or (vai cua)) tre*.