Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh my » trinh my, anh my, tran mi
toan hoc » toan khoa, van hoc, hoa hoc
te sach » toc sach
tranh y » trinh y, tranh o, tranh 30
y huyet » ly huyet, ly thuyet, cay huyet
hoc hoc » hoc hoa, toc hoc, hoc hoi
tu sach » thu sach, su sach, tu cach
tran sy » tran si, tran duy, tran quy

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tranh y huyet hoc hoc ) or ( tu sach ((tranh my) OR (tran sy)) thuat toan hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tranh y huyet hoc hoc ) OR ( tu sach ((tranh my) OR (tran sy)) thuat toan hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach tranh y huyet hoc hoc ) or ( tu sach ((tranh my) OR (tran sy)) thuat toan hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach tranh y huyet hoc hoc ) or ( tu sach ((tranh my) OR (tran sy)) thuat toan hoc ))*.