Perhaps you should try some spelling variations:
tam thuc » tham thuc, am thuc, nam thuc
thuc ban » thuoc ban, thuc dan, thu ban
hanh vai » hanh vi, hanh va, hanh van
hanh tai » thanh tai, hang tai, han tai
cua viet » ca viet, hoa viet, cua vat
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va tam » van tam, va tham, va tac

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. hieu va tam thuc ban ((hanh vai) or (hanh tai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky mang may hoi. hieu va tam thuc ban ((hanh vai) OR (hanh tai)) cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky mang may hoi. hieu va tam thuc ban ((hanh vai) or (hanh tai)) cua viet*.