Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
va nang » van nang, da nang, cam nang
y lang » o lang, _ lang, tay lang
tuc va » thuc va, truc va, tuc xa
di va » dai va, 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 y lang xa hoi. ((hieu ve) OR (hieu va)) cac tuc va nang ((di va) OR (di vao)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y lang xa hoi. ((hieu ve) or (hieu va)) cac tuc va nang ((di va) OR (di vao)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. ((hieu ve) or (hieu va)) cac tuc va nang ((di va) OR (di vao)) triet*.