Perhaps you should try some spelling variations:
thien van » thi van
lang van » dang van, tang van, hoang van
cac quoc » cac nuoc, cac cuoc, cao quoc
hieu van » hieu va, lieu va, hieu ve
te sach » toc sach
benh ve » benh va, benh vien, benh viem
co benh » con benh, so benh, o benh
quoc co » quoc cao, quoc cho, duoc co
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te 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 van)) hoi. ((hieu van) OR (thien van)) cac quoc co benh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((lang xa) OR (lang van)) hoi. ((hieu van) OR (thien van)) cac quoc co benh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((lang xa) or (lang van)) hoi. ((hieu van) OR (thien van)) cac quoc co benh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((lang xa) or (lang van)) hoi. ((hieu van) OR (thien van)) cac quoc co benh ve cua tre*.