Perhaps you should try some spelling variations:
sach tranh » canh tranh
cac nganh » hoc nganh
nganh xay » nganh mac, nganh y, nganh ma
xay thuat » ky thuat, my thuat, va thuat
tranh che » tranh chap, tranh chua, tranh cua
che thuat » chien thuat, nghe thuat, thu thuat
thuat hoa » thuyet hoa, thuat do, thuat o
toan hoc » toan khoa, van hoc, tin hoc
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cac nganh xay thuat toan hoc ) or ( tu sach tranh che thuat hoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cac nganh xay thuat toan hoc ) OR ( tu sach tranh che thuat hoa hoc ))*.