Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lai » hanh lam, hanh tai, thanh lap
thu sach » tu sach, thuat sach, thuoc sach
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
sach ty » sach y, sach tu, sach thu
va cham » va chat
va tham » van tham, va thanh, va thuat
va hanh » van hanh, va thanh, va danh
ty nang » ky nang, ty xang, ty hang
lai cua » dai cua, hai cua, lai chau

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 ty nang ((mai hoi) OR (dai hoi)). hieu ((va cham) or (va tham)) duc va hanh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((mai hoi) OR (dai hoi)). hieu ((va cham) OR (va tham)) duc va hanh lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang ((mai hoi) OR (dai hoi)). hieu ((va cham) or (va tham)) duc va hanh lai cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((mai hoi) OR (dai hoi)). hieu ((va cham) or (va tham)) duc va hanh lai cua triet*.