Perhaps you should try some spelling variations:
sach nganh » sach ngan, cac nganh, sach danh
thuyet hoc » huyet hoc, thuyet hoa, tuyet hoc
ky thuyet » ly thuyet, ky thuat, li thuyet
tranh my » trinh my, tran sy, anh my
my thuat » ky thuat, ki thuat, va thuat
su canh » suc canh, su can, su anh
hoc hoc » hoc hoa, toc hoc, hoc hoi
toan » tran

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

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