Perhaps you should try some spelling variations:
sach nganh » sach ngan, cac nganh, sach danh
sach tranh » canh tranh
tranh ki » trinh ki, thanh kim, tranh cai
ki thuat » ky thuat
toan hoc » toan khoa, van hoc, hoa hoc
thu sach » tu sach, thuat sach, thuoc sach
nganh ky » nganh y, nganh xay, hanh ky
thuat va » thuyet va, thuat bai, thuat bao
te sach » toc sach

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

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