Perhaps you should try some spelling variations:
quoc bao » quoc oai, hoc bao, quoc va
toc sach » hoc sach, doc sach, thuoc sach
benh le » benh ly, benh ve, benh he
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
quoc bo » nuoc bo, quoc co, quoc lo
le cua » ly cua
va cau » van cau, va cac, va dau
y lang » o lang, _ lang, tay lang
cua te » cua tu

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: ((te sach) OR (toc sach)) y lang xa hoi. hieu va cau ((quoc bo) OR (quoc bao)) benh le cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) y lang xa hoi. hieu va cau ((quoc bo) OR (quoc bao)) benh le cua te~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) y lang xa hoi. hieu va cau ((quoc bo) OR (quoc bao)) benh le cua te*.