Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tranh xay » trinh xay, trong xay, manh xay
xay thuat » my thuat, va thuat, cac thuat
thu sach » tu sach, thuat sach, thu hoach
toan hoc » van hoc, hoa hoc, tin hoc
ngan ky » nganh ky, nhan ky, ngan hay
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: (( ((thu sach) OR (thuoc sach)) ngan 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: (( ((thu sach) OR (thuoc sach)) ngan 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: "(( ((thu sach) OR (thuoc sach)) ngan ky thuat toan khoa ) or ( tu canh tranh xay thuat toan hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( ((thu sach) OR (thuoc sach)) ngan ky thuat toan khoa ) or ( tu canh tranh xay thuat toan hoc ))*.