Perhaps you should try some spelling variations:
thien van » thi van
ban benh » san benh, ba benh, ban banh
quoc ban » quoc bao, quoc lan, quoc quan
cam quoc » cac quoc, cao quoc, nam quoc
te sach » toc sach
benh va » benh ve, benh dai, benh tai
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
lang xa » dang xay, lang van
lang ha » long ha
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((lang xa) OR (lang ha)) hoi. ((thien van) or (hieu va)) cam quoc ban benh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((lang xa) OR (lang ha)) hoi. ((thien van) OR (hieu va)) cam quoc ban benh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((lang xa) OR (lang ha)) hoi. ((thien van) or (hieu va)) cam quoc ban benh va cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((lang xa) OR (lang ha)) hoi. ((thien van) or (hieu va)) cam quoc ban benh va cua tre*.