Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
vai cua » dai cua, hai cua, lai cua
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
tay hoi » tay ho, tao hoi, tay thai
may hoi » may thoi, mai hoi, may hmi
ky mang » ky nang, ke mang, ky dang
tu bai » tu ban, tu bat, te bai
tu sai » tu san, tu cai, tu lai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sai) or (tu bai)) ky mang ((may hoi) or (tay hoi)). hieu va tham thuc ban hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sai) OR (tu bai)) ky mang ((may hoi) OR (tay hoi)). hieu va tham thuc ban hanh vai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sai) or (tu bai)) ky mang ((may hoi) or (tay hoi)). hieu va tham thuc ban hanh vai cua triet*.