Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
sach ngan » sach ngon, sach nha, sach han
thu canh » thuc hanh, thu cong, thu ban
trinh ke » trinh ky, trinh he, trinh do
ke thuat » ki thuat, ve thuat, te thuat
toan hoc » toan khoa, van hoc, hoa hoc
tu sach » thu sach, su sach, te sach
ngan ky » nganh ky, nhan ky, ngan hay
thuat o » thuat do
o hoc » co hoc, mo hoc, so hoc

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 thuat o hoc ) or ( thu canh trinh ke thuat toan hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach ngan ky thuat o hoc ) OR ( thu canh trinh ke thuat toan hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach ngan ky thuat o hoc ) or ( thu canh trinh ke thuat toan hoc ))*.