Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
va triet » va thiet, va trien, ve triet
danh doi » danh di, dung doi, danh hoa
sach ky » sac ky, sach y, sach ty
cac toc » cac toi, cac nuoc, cac thoi
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
toc xa » tuc xa, toc ta, hoc xa
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) or (tang ma)) hoi. hieu ve cac toc xa ((danh doi) or (thanh doi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang ma) OR (tang ma)) hoi. hieu ve cac toc xa ((danh doi) OR (thanh doi)) va triet.
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang ma) or (tang ma)) hoi. hieu ve cac toc xa ((danh doi) or (thanh doi)) va triet*.