Perhaps you should try some spelling variations:
thong minh » thong tin
can thong » ban thong, van thong, chan thuong
sach cha » sach nha, sach che, sach ha
van giai » va giai, dan giai, van giao
giai can » giai han, giai san, giai ca
co hoang » do hoang, cam hoang, cap hoang
su sach » so sach, vu sach
cha van » chao van, chau van, chat van
nhan ve » nhan va, nhat ve, nhin ve
giai co » giai cao, gian co, gioi co
nha ve » nhat ve, nha va, pha ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach cha van giai can thong minh ) or ( su sach ((nha ve) OR (nhan ve)) giai co hoang minh ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach cha van giai can thong minh ) OR ( su sach ((nha ve) OR (nhan ve)) giai co hoang minh )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach cha van giai can thong minh ) or ( su sach ((nha ve) OR (nhan ve)) giai co hoang minh ))".
• Adding a wildcard symbol may retrieve word variants: (( su sach cha van giai can thong minh ) or ( su sach ((nha ve) OR (nhan ve)) giai co hoang minh ))*.