Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
y lang » o lang, _ lang, tay lang
va cam » va cham, va cac, va cao
va dau » va dao
vi cu » vi su, vi xu
vi du » vi dum, va du, ve du

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: toc sach y lang xa hoi. hieu va cam xuc ((va dau) OR (ca dao)) ((vi cu) OR (vi du)) tren~.
• Adding a wildcard symbol may retrieve word variants: toc sach y lang xa hoi. hieu va cam xuc ((va dau) or (ca dao)) ((vi cu) or (vi du)) tren*.