Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van chat » cao chat
benh te » benh tre, benh ve, benh he
van cau » van dau, van hau, toan cau
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
quoc o » quoc co, quoc lo, quoc so
o benh » so benh, hoc benh, soc benh
te cua » tue cua, le cua, de cua
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 ((van cau) OR (van chat)) quoc o benh te 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 ((van cau) OR (van chat)) quoc o benh te cua te~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) y lang xa hoi. hieu ((van cau) OR (van chat)) quoc o benh te cua te*.