Perhaps you should try some spelling variations:
sach nganh » sach ngan, cac nganh, cach nhanh
sach tranh » canh tranh
sach danh » sach dao, sach dung, sach kinh
ly huyet » ly thuyet, li thuyet, ly chuyen
su sach » so sach, vu sach
tranh y » trinh y, tranh o, tranh 30
y thuat » ky thuat, my thuat, kxy thuat
hoc hoc » hoc hoa, toc hoc, hoc hoi
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 sach tranh y thuat toan khoa ) or ( su ((sach nganh) OR (sach danh)) ly huyet hoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tranh y thuat toan khoa ) OR ( su ((sach nganh) OR (sach danh)) ly huyet hoc hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach tranh y thuat toan khoa ) or ( su ((sach nganh) OR (sach danh)) ly huyet hoc hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( su sach tranh y thuat toan khoa ) or ( su ((sach nganh) OR (sach danh)) ly huyet hoc hoc ))*.