Perhaps you should try some spelling variations:
hong minh » hoang minh, thong minh, khong minh
giai toan » giai doan, giai toa, gioi toan
toc sach » hoc sach, doc sach, thuoc sach
con hong » con song, cong thong, cong khong
giai con » gian con, giai doan, giao cong
sach che » sach thue, sach nha, sach cap
me giai » de giai, ve giai, ke giai
xa dan » ca dan, xa dai, ma dan
va dan » ca dan, va dao, va dau
che me » che my
thong » trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach che me giai toan thong tin ) or ( toc sach ((xa dan) OR (va dan)) giai con hong minh ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach che me giai toan thong tin ) OR ( toc sach ((xa dan) OR (va dan)) giai con hong minh ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach che me giai toan thong tin ) or ( toc sach ((xa dan) OR (va dan)) giai con hong minh ))*".