Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
quoc bao » quoc oai, hoc bao, quoc va
quoc lan » quoc ban, nuoc luan, quoc quan
te sach » toc sach
van lam » van nam
benh li » benh ly, benh lo, benh vi
cua tre » cua te, cuu tre, cua triet
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land
li cua » lai cua, le cua, ly cua

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 ((y lang) OR (_ lang)) xa hoi. hieu van lam ((quoc bao) OR (quoc lan)) benh li cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y lang) OR (_ lang)) xa hoi. hieu van lam ((quoc bao) or (quoc lan)) benh li cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ((y lang) OR (_ lang)) xa hoi. hieu van lam ((quoc bao) or (quoc lan)) benh li cua tre*.