Perhaps you should try some spelling variations:
toan dinh » tran dinh, toan kinh, doan dinh
khien hoc » nhiet hoc
sach tien » sach tren, sach thieu
dinh cac » tinh cach, dinh chuc, dinh chau
dien hoc » dien hoa, tin hoc, lieu hoc
tien cac » thien cac, trien cac, vien cac
cac khoa » cac khoan, cac khoi, dac khoa
khoa hoc » hoa hoc
vu sach » vu bach, su sach, vu khach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuat toan dinh cac ((khien hoc) or (dien hoc)) ) or ( vu sach tien cac khoa hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat toan dinh cac ((khien hoc) OR (dien hoc)) ) OR ( vu sach tien cac khoa hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thuat toan dinh cac ((khien hoc) or (dien hoc)) ) or ( vu sach tien cac khoa hoc ))*.