Perhaps you should try some spelling variations:
sach nganh » sach tranh, cac nganh, sach danh
sach ngan » sach ngon, sach nha, sach han
xay nganh » cac nganh, da nganh, nam nganh
thuat hoa » thuyet hoa, thuat do, thuat o
toan hoc » toan khoa, van hoc, tin hoc
nganh ky » nganh y, nganh xay, hanh ky

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

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