Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua viet » ca viet, hoa viet, cua vat
gay thoi » may thoi, tay thoi, ngay tuoi
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
hanh va » hang va, hanh vi
hieu va » hieu qua
va cua » va chua, via cua, ca cua
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 mang ((may hoi) or (gay thoi)). ((hieu va) or (lieu va)) tham thuc dan hanh va cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky mang ((may hoi) OR (gay thoi)). ((hieu va) OR (lieu va)) tham thuc dan hanh va cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky mang ((may hoi) or (gay thoi)). ((hieu va) or (lieu va)) tham thuc dan hanh va cua viet*.