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

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. hieu va nham thuc ban hanh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sai) OR (tu bai)) ky mang may hoi. hieu va nham thuc ban hanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sai) OR (tu bai)) ky mang may hoi. hieu va nham thuc ban hanh vai cua triet*.