Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
toc sach » hoc sach, doc sach, thuoc sach
xa doanh » va doanh, hoa doanh, van doanh
thac toc » cac toc, thac cac, thi toc
sach tay » xach tay, sach hay, sach nay
hieu van » thien van, lieu va, hieu ve
lang ha » long ha
hieu va » lieu va, hieu qua
lang xa » dang xay, lang van
ban cua » ban quan
cua tre » cua te, cuu tre, cua triet
toc xa » tuc xa, toc ta, hoc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tay ((lang xa) OR (lang ha)) hoi. ((hieu van) or (hieu va)) thac toc xa doanh ban cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tay ((lang xa) OR (lang ha)) hoi. ((hieu van) OR (hieu va)) thac toc xa doanh ban cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tay ((lang xa) OR (lang ha)) hoi. ((hieu van) or (hieu va)) thac toc xa doanh ban cua tre*".