Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
va doanh » van doanh, vay doanh, va danh
tay lang » tai lang, tay tang, tay quang
dan cua » dan ca, ban cua, dai cua
cau toc » cac toc, cao toc, cau hoc
van cau » van dau, van hau, van chat
toc va » hoc va, toc ta, tuc va
y lang » o lang, _ lang, yen 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) OR (tay lang)) xa hoi. hieu van cau toc va doanh dan cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((y lang) or (tay lang)) xa hoi. hieu van cau toc va doanh dan cua te~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((y lang) or (tay lang)) xa hoi. hieu van cau toc va doanh dan cua te*.