Perhaps you should try some spelling variations:
nang doi » hang doi, nang dong, nhung doi
nang doc » nang luc
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
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 nang xa hoi. hieu ve cac tuc xa ((((nang doi) or (nang doc))) or (nang noi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ve cac tuc xa ((((nang doi) OR (nang doc))) OR (nang noi)) va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ve cac tuc xa ((((nang doi) or (nang doc))) or (nang noi)) va triet*.