Perhaps you should try some spelling variations:
nam quoc » nam duoc, nam buoc, nam thuoc
quoc bao » quoc oai, hoc bao, quoc va
tay lang » tai lang, tay tang, tay quang
hieu van » hieu va, thien van, lieu va
benh ve » benh vien, benh viem
benh va » benh dai, benh tai
te sach » toc sach
y lang » o lang, _ lang, yen lang
cua te » cua tu

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) or (tay lang)) xa hoi. hieu van nam quoc bao ((benh va) OR (benh ve)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y lang) OR (tay lang)) xa hoi. hieu van nam quoc bao ((benh va) OR (benh ve)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y lang) or (tay lang)) xa hoi. hieu van nam quoc bao ((benh va) OR (benh ve)) cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ((y lang) or (tay lang)) xa hoi. hieu van nam quoc bao ((benh va) OR (benh ve)) cua te*.