Perhaps you should try some spelling variations:
sach ky » sac ky, sach y, sach ty
va lang » va nang, hoa lang
cac toc » cac toi, cac nuoc, cac thoi
tu sach » thu sach, su sach, te sach
cac tuc » cac tu, cac tac, cac nuoc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
dai va » mai va
di va » di vao, doi va, di vat

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu ve ((cac tuc) OR (cac toc)) va lang ((di va) OR (dai 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) OR (cac toc)) va lang ((di va) or (dai va)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu ve ((cac tuc) OR (cac toc)) va lang ((di va) or (dai va)) triet*.