Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua viet » ca viet, hoa viet, cua vat
thuc ban » thuoc ban, thuc dan, thu ban
hanh hai » thanh hai, nhanh hai, hang hai
ban hanh » ban hang
ky dang » ky nang, ky danh
van hoi » van hoc, van hoe, van loi
hai cua » thai cua, dai cua, hoi cua
hieu va » hieu qua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai 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 sac ky dang ((van hoi) or (van hoa)). ((hieu va) or (lieu va)) tham thuc ban hanh hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang ((van hoi) OR (van hoa)). ((hieu va) OR (lieu va)) tham thuc ban hanh hai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang ((van hoi) or (van hoa)). ((hieu va) or (lieu va)) tham thuc ban hanh hai cua viet*.