Perhaps you should try some spelling variations:
sach nganh » sach ngan, sach tranh, cac nganh
thuyet hoc » huyet hoc, thuyet hoa, tuyet hoc
tranh my » trinh my, tran sy, anh my
my thuat » ky thuat, ki thuat, va thuat
nganh ly » nganh y, nganh ky, nganh xay
su canh » suc canh, su anh, luc canh
su sach » so sach, vu sach
hoc hoi » hoc khoi, hoc hoa, hoc noi
su can » su van, su cao, tu can
toan » tran

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

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