Perhaps you should try some spelling variations:
vien dai » hien dai
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vien da » hien dai
sach ky » sac ky, sach y, sach ty
te sach » toc sach
tuc va » thuc va, truc va, tuc xa
va dau » va dao
vi cua » vai cua
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang xa hoi. hieu ((vien da) or (vien dai)) tuc va dau ((vi cua) OR (di cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. hieu ((vien da) OR (vien dai)) tuc va dau ((vi cua) OR (di cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu ((vien da) or (vien dai)) tuc va dau ((vi cua) OR (di cua)) triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu ((vien da) or (vien dai)) tuc va dau ((vi cua) OR (di cua)) triet*.