Perhaps you should try some spelling variations:
thong hinh » thong chinh, thong minh, hong hinh
can thong » ban thong, van thong, chan thuong
con thong » cong thong, con hong, cong thuong
giai can » giai han, giai san, giai ca
te sach » toc sach
dung me » dung he, dung mo, dung de
me giai » de giai, ke giai, te giai
sach ha » sach nha, sach han, sach xa
le giai » de giai, ly giai, ke giai
ve giai » va giai, ve giao, de giai
tin » tinh

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 dung me giai can thong hinh ) OR ( te sach ha ((le giai) OR (ve giai)) con thong tin ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach dung me giai can thong hinh ) or ( te sach ha ((le giai) OR (ve giai)) con thong tin ))~".
• Adding a wildcard symbol may retrieve word variants: (( te sach dung me giai can thong hinh ) or ( te sach ha ((le giai) OR (ve giai)) con thong tin ))*.