Perhaps you should try some spelling variations:
sau benh » san benh, phau benh, tai benh
quoc sau » quoc su, quoc suu, quoc sach
te sach » toc sach
va ngay » tan ngay
benh di » benh dai, ben di, benh da
cua tre » cua te, cuu tre, cua triet
va nay » va cay
y song » _ song, k song, hay song
c song » _ song, k song, cua song
di cua » dai cua, doi cua, de 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 song) or (c song)) xa hoi. hieu ((va nay) OR (va ngay)) quoc sau benh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y song) OR (c song)) xa hoi. hieu ((va nay) OR (va ngay)) quoc sau benh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y song) or (c song)) xa hoi. hieu ((va nay) OR (va ngay)) quoc sau benh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((y song) or (c song)) xa hoi. hieu ((va nay) OR (va ngay)) quoc sau benh di cua tre*.