Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua triet » cua viet, va triet
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
su triet » su viet, su tien, ve triet
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh

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

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