Perhaps you should try some spelling variations:
hieu vien » hieu hien, thieu nien, hieu tieng
hieu viec » nhieu viec, hieu ve, sieu viet
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 tuc » cac toc, cac tu, cac tac
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tu sach » thu sach, su sach, te sach

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