Perhaps you should try some spelling variations:
nguoi sach » nguoi san, nuoc sach
cham thuc » nham thuc, pham thuc, tham thuc
dang xay » dang van, van xay
qua cham » qua hai, qua cac, va cham
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (nguoi sach)) ky dang xay hoi. hieu qua cham thuc va danh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (nguoi sach)) ky dang xay hoi. hieu qua cham thuc va danh vi su triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (nguoi sach)) ky dang xay hoi. hieu qua cham thuc va danh vi su triet*.