Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dung doi » huong doi, dung tai, dung co
danh doi » danh di, thanh doi, danh hoa
cac tac » cac toc, cac bac, cac dac
sach ky » sac ky, sach y, sach ty
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
tac xa » tuc xa, tac da
ma hoi » xa 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 (mai hoi)). hieu ve cac tac xa ((danh doi) or (dung doi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((ma hoi) OR (mai hoi)). hieu ve cac tac xa ((danh doi) OR (dung doi)) su triet.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((ma hoi) or (mai hoi)). hieu ve cac tac xa ((danh doi) or (dung doi)) su triet*.