Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
tu cach » tu cac
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
va nang » van nang, da nang, cam nang
nang di » nang du, hang di, nang ji
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
di va » dai va, di vao, doi 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 cach) or (thu sach)) ky lang xa hoi. hieu ve cac tuc va nang di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky lang xa hoi. hieu ve cac tuc va nang di va triet.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky lang xa hoi. hieu ve cac tuc va nang di va triet*.