Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
va triet » va trien, ve triet, cua triet
vien cac » vien bach, vien dai, vien da
nang doc » nang luc
tu sach » thu sach, su sach, te sach
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
thiet » thieu

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