Perhaps you should try some spelling variations:
sach ty » sach tu, sach thu, xach tay
benh ve » benh va, benh vien, benh viem
binh ve » dinh ve, binh va, kinh ve
xua gia » cua gia, qua gia, xua kia
nam xua » nam cua, nam mua, nam qua
hieu va » lieu va, hieu qua
nang o » nang co, nang ho, nang ro
va nam » van nam, ha nam, va nay
o hoi » co hoi, o hoc, o hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang o hoi. hieu va nam xua gia thanh ((binh ve) OR (benh ve)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang o hoi. hieu va nam xua gia thanh ((binh ve) OR (benh ve)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang o hoi. hieu va nam xua gia thanh ((binh ve) OR (benh ve)) triet*.