Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham thuc » nham thuc, pham thuc, tham thuc
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
te sach » toc sach
va cua » va chua, via cua, ca cua
5 hoi » o hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (su sach)) ky nang ((5 hoi) or (xa hoi)). hieu ve cham thuc va hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ky nang ((5 hoi) OR (xa hoi)). hieu ve cham thuc va hanh va cua triet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ky nang ((5 hoi) or (xa hoi)). hieu ve cham thuc va hanh va cua triet*.