Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
tranh xay » trinh xay, manh xay, nganh xay
trong xay » thong xay, trong cac, trong ca
thuat hoa » thuyet hoa, thuat do, thuat o
nganh ky » nganh y, nganh xay, hanh ky
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 sach nganh ky thuat toan hoc ) or ( tu sach ((tranh xay) OR (trong xay)) thuat hoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach nganh ky thuat toan hoc ) OR ( tu sach ((tranh xay) OR (trong xay)) thuat hoa hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach nganh ky thuat toan hoc ) or ( tu sach ((tranh xay) OR (trong xay)) thuat hoa hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach nganh ky thuat toan hoc ) or ( tu sach ((tranh xay) OR (trong xay)) thuat hoa hoc ))*.