Perhaps you should try some spelling variations:
phau benh » kham benh
cam quoc » cac quoc, cao quoc, nam quoc
san benh » sau benh, tai benh, so benh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
y lang » _ lang, tay lang, yen lang
o lang » hoa lang, hoi lang
vi cua » vai cua, di cua

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 ((y lang) OR (o lang)) xa hoi. hieu van cam quoc ((san benh) OR (phau benh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y lang) OR (o lang)) xa hoi. hieu van cam quoc ((san benh) or (phau benh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y lang) OR (o lang)) xa hoi. hieu van cam quoc ((san benh) or (phau benh)) vi cua tre*.