Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
may hoi » may thoi, tay hoi, mai hoi
ky mang » ky nang, ke mang, ky dang
tu banh » tu hanh, tu manh, tu anh
va cua » va chua, via cua, ma cua
ca cua » co cua
tu ban » thu ban, te ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu ban) or (tu banh)) ky mang may hoi. hieu va nham thuc ban hanh ((va cua) OR (ca cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu ban) OR (tu banh)) ky mang may hoi. hieu va nham thuc ban hanh ((va cua) OR (ca cua)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu ban) or (tu banh)) ky mang may hoi. hieu va nham thuc ban hanh ((va cua) OR (ca cua)) triet*".