Perhaps you should try some spelling variations:
cau quoc » cac quoc, cao quoc, han quoc
toc sach » hoc sach, doc sach, thuoc sach
quoc bo » quoc bao, nuoc bo, quoc co
benh he » benh heo, benh ve, benh theo
benh le » benh ly, benh ve, benh li
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
va cau » van cau, va cac, va dau
y lang » o lang, _ lang, tay lang
cua te » cua tu

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: ((te sach) OR (toc sach)) y lang xa hoi. hieu va cau quoc bo ((benh le) OR (benh he)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) y lang xa hoi. hieu va cau quoc bo ((benh le) OR (benh he)) cua te~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) y lang xa hoi. hieu va cau quoc bo ((benh le) OR (benh he)) cua te*.