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
may hoi » may thoi, tay hoi, mai hoi
ky dang » ky nang, ky danh
ky mang » ky nang, ke mang, ky tang
su sach » so sach, vu sach
tu sac » tu sach, tu cac, tu san

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 (su sach)) ((ky mang) OR (ky dang)) may hoi. hieu va tham thuc ban hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (su sach)) ((ky mang) OR (ky dang)) may hoi. hieu va tham thuc ban hanh vai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (su sach)) ((ky mang) OR (ky dang)) may hoi. hieu va tham thuc ban hanh vai cua triet*".