Perhaps you should try some spelling variations:
thong minh » thong tin, hoang minh
can thong » ban thong, van thong, chan thuong
doc sach » hoc sach, toc sach, nuoc sach
giai van » gioi van, giai han, giai san
sach cha » sach nha, sach che, sach ha
hoa sinh » cho sinh
gioi can » gioi van, gioi cam, gioi cau
ve gioi » ve giai, vien gioi, van gioi
thue ve » thue va, thue ke, thuyet ve
thuc ve » thuc va, thuc te, thuc viet
tu sach » thu sach, su sach, te sach
cha ve » cha me, ca ve, 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: (( doc sach cha ve gioi can thong minh ) or ( tu sach ((thue ve) OR (thuc ve)) giai van hoa sinh ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( doc sach cha ve gioi can thong minh ) OR ( tu sach ((thue ve) OR (thuc ve)) giai van hoa sinh )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( doc sach cha ve gioi can thong minh ) or ( tu sach ((thue ve) OR (thuc ve)) giai van hoa sinh ))".
• Adding a wildcard symbol may retrieve word variants: (( doc sach cha ve gioi can thong minh ) or ( tu sach ((thue ve) OR (thuc ve)) giai van hoa sinh ))*.