Perhaps you should try some spelling variations:
cac quoc » cac nuoc, cac cuoc, cao quoc
dang van » hoang van, hang va
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cua tre » cua te, cua triet, dua tren
benh ve » benh va, benh vien, benh viem
co benh » con benh, so benh, o benh
quoc co » quoc cao, quoc cho, duoc co
van cac » van hac, van cau, van bac
lang xa » lang ha, dang xay, lang van
cuu tre » cau tren, cau treo

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