Perhaps you should try some spelling variations:
ve triet » va trien, su triet
nang doc » nang luc
va triet » va thiet, va trien, cua triet
nang doi » nang noi, hang doi, nang dong
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tu sach » thu sach, su sach, te sach
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: tu sach ky lang xa hoi. hieu ve cac tuc xa ((nang doi) or (nang doc)) ((va triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu ve cac tuc xa ((nang doi) OR (nang doc)) ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu ve cac tuc xa ((nang doi) or (nang doc)) ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu ve cac tuc xa ((nang doi) or (nang doc)) ((va triet) OR (ve triet))*.