Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
da nang » cam nang, kha nang, cao nang
xa nong » xa dong, xuat nong, may nong
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cac » vien cac
doi va » hoi va, noi va, dai va

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