Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
va thanh » gia thanh, ban thanh, va tinh
dang xay » dang van, van xay
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cac tac » cac toc, cac bac, cac dac
tac va » tac da, tac xa, tuc va

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