Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
cach tranh » canh tranh, sach tranh, cac thanh
kki thuat » khoi thuat, ky thuat, mi thuat
thu sach » tu sach, thuat sach, thuoc sach
nganh ki » nganh ky, nganh ke, nganh vi
ki thuat » ky thuat
thuat do » thuat o
toan hoc » toan khoa, van hoc, hoa hoc
tu cach » tu cac
ky thua » ky thuat, ky thu, kxy thuat
do hoc » co hoc, do hoa, du hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach nganh ki thuat do hoc ) or ( tu cach tranh ((ky thua) or (kki thuat)) toan hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach nganh ki thuat do hoc ) OR ( tu cach tranh ((ky thua) OR (kki thuat)) toan hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach nganh ki thuat do hoc ) or ( tu cach tranh ((ky thua) or (kki thuat)) toan hoc ))*.