Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thuc ban » thuoc ban, thuc dan, thu ban
hanh tai » thanh tai, hang tai, han tai
hanh vai » hanh vi, hanh va, hanh van
cua viet » ca viet, hoa viet, cua vat
mang mai » mang may, lang mai, mang lai
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
mai hoi » mai khoi, dai hoi, lai hoi
ky mang » ky nang, ke mang, ky dang
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 mai hoi. hieu va tham 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 mai hoi. hieu va tham thuc ban ((hanh vai) OR (hanh tai)) cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky mang mai hoi. hieu va tham thuc ban ((hanh vai) or (hanh tai)) cua viet*.