Perhaps you should try some spelling variations:
tranh xay » trinh xay, trong xay, manh xay
xay thuat » ky thuat, my thuat, va thuat
toan hoc » van hoc, hoa hoc, tin hoc
tu sach » thu sach, su sach, te sach
ngan ky » nganh ky, ngan hay, nganh ke
nhan ky » nhan y, nhat ky, than ky
tu canh » thu canh, tu chanh, tu can

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

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