Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
hau thuc » huu thuc, ha thuc, mau thuc
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thuoc sach
van hau » van ha, van hai, van dau
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (su sach)) ky nang ((ma hoi) OR (mai hoi)). hieu van hau thuc va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang ((ma hoi) OR (mai hoi)). hieu van hau thuc va hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ky nang ((ma hoi) OR (mai hoi)). hieu van hau thuc va hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang ((ma hoi) OR (mai hoi)). hieu van hau thuc va hanh dai cua triet*.