Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
nang noi » nang doc
nang doi » nang doc, hang doi, nang dong
sach ky » sac ky, sach y, sach ty
cac tac » cac toc, cac bac, cac dac
tu sach » thu sach, su sach, te sach
cac tuc » cac toc, cac tu, cac nuoc
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh

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 dang xa hoi. hieu ve ((cac tuc) or (cac tac)) xa ((nang doi) or (nang noi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu ve ((cac tuc) OR (cac tac)) xa ((nang doi) OR (nang noi)) va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu ve ((cac tuc) or (cac tac)) xa ((nang doi) or (nang noi)) va triet*.