Perhaps you should try some spelling variations:
danh thanh » dinh thanh, nhanh thanh, ban thanh
dang thanh » dong thanh, dang hanh, hoang thanh
thuat bang » thuat ban, thuat mang, thuat nang
sach nhan » sach nha, sach han, sach ngan
thuat hoa » thuat toan, thuyet hoa, thuat do
bang hoc » nang hoc, mang hoc, quang hoc
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) OR (dang thanh)) ky thuat bang hoc ) or ( so sach nhan y thuat hoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so ((danh thanh) OR (dang thanh)) ky thuat bang hoc ) OR ( so sach nhan y thuat hoa hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so ((danh thanh) OR (dang thanh)) ky thuat bang hoc ) or ( so sach nhan y thuat hoa hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( so ((danh thanh) OR (dang thanh)) ky thuat bang hoc ) or ( so sach nhan y thuat hoa hoc ))*.