Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dung doi » huong doi, dung tai, dung co
danh doi » danh di, thanh doi, danh hoa
mai khoi » mai khoa, tai khoa, cac khoi
hieu van » hieu va, thien van, lieu va
cac tuc » cac toc, cac tu, cac tac
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
ma hoi » mai hoi, xa hoi, ma hoa

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 (mai khoi)). hieu van cac tuc xa ((danh doi) or (dung doi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((ma hoi) OR (mai khoi)). hieu van cac tuc xa ((danh doi) OR (dung doi)) cua triet.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((ma hoi) or (mai khoi)). hieu van cac tuc xa ((danh doi) or (dung doi)) cua triet*.