Perhaps you should try some spelling variations:
danh thanh » dinh thanh, dang thanh, nhanh thanh
thuat bang » thuat ban, thuat mang, thuat nang
sach nhan » sach nha, sach han, sach ngan
thanh ky » hanh ky, than ky, thanh tay
bang hoc » nang hoc, mang hoc, quang hoc
toan hoc » toan khoa, van hoc, tin hoc
so danh » do danh, so sanh, so dan
so sach » so sanh, bo sach, co sach
y thuat » my thuat, kxy thuat, ki thuat

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so danh thanh ky thuat bang hoc ) or ( so sach nhan y thuat ((toan hoc) OR (hoa hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so danh thanh ky thuat bang hoc ) OR ( so sach nhan y thuat ((toan hoc) OR (hoa hoc)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so danh thanh ky thuat bang hoc ) or ( so sach nhan y thuat ((toan hoc) OR (hoa hoc)) ))".
• Adding a wildcard symbol may retrieve word variants: (( so danh thanh ky thuat bang hoc ) or ( so sach nhan y thuat ((toan hoc) OR (hoa hoc)) ))*.