Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
xa nang » va nang, ca nang, xa bang
da nang » cam nang, kha nang, cao nang
xa nong » xa dong, xuat nong, may nong
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cac » va 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 tuc ((((xa nang) OR (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 tuc ((((xa nang) OR (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 tuc ((((xa nang) OR (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 tuc ((((xa nang) OR (xa nong))) or (da nang)) doi va triet*.