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
tu sach » thu sach, su sach, te sach
ke mang » ke nang, ke trang
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
hanh va » hang va, hanh vi
tu sac » tu cac, tu san, tu bac
va cua » va chua, via cua, ca cua

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