Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh loi » thanh hoa, thanh hai, thanh lap
thanh doi » thanh moi, thanh do, thanh hoai
cac tuc » cac toc, cac tu, cac tac
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ((ma hoi) OR (xa hoi)). hieu ve cac tuc xa ((thanh doi) or (thanh loi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((ma hoi) OR (xa hoi)). hieu ve cac tuc xa ((thanh doi) OR (thanh loi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ((ma hoi) OR (xa hoi)). hieu ve cac tuc xa ((thanh doi) or (thanh loi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((ma hoi) OR (xa hoi)). hieu ve cac tuc xa ((thanh doi) or (thanh loi)) cua triet*.