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

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) OR (hang tai)))) ca 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) OR (hang tai)))) ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky mang may hoi. hieu va tam thuc ban ((hanh vai) or (((hanh tai) OR (hang tai)))) ca 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) OR (hang tai)))) ca viet*.