Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
suc van » duc van, luc van, sac van
ma hoi » mai hoi, ma hoa, me hoi
ve bao » te bao, va bao
su van » tu van, vu van

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 ky nang ((ma hoi) or (xa hoi)). hieu ve bao ((suc van) OR (su van)) thanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((ma hoi) OR (xa hoi)). hieu ve bao ((suc van) OR (su van)) thanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((ma hoi) or (xa hoi)). hieu ve bao ((suc van) OR (su van)) thanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((ma hoi) or (xa hoi)). hieu ve bao ((suc van) OR (su van)) thanh dai cua triet*.