Perhaps you should try some spelling variations:
toan dinh » tran dinh, toan kinh, doan dinh
cac khien » cac chien, cac phien, cach thien
khien hoc » nhiet hoc, dien hoc
dinh cac » tinh cach, dinh chuc, dinh chau
sach xin » sach kinh, sach tien, sach xa
cac khoa » cac khoan, cac khoi, cao khoa
dac khoa » da khoa, dai khoa, dau khoa
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 ( vu sach xin ((cac khoa) OR (dac khoa)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat toan dinh cac khien hoc ) OR ( vu sach xin ((cac khoa) OR (dac khoa)) hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thuat toan dinh cac khien hoc ) or ( vu sach xin ((cac khoa) OR (dac khoa)) hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( thuat toan dinh cac khien hoc ) or ( vu sach xin ((cac khoa) OR (dac khoa)) hoc ))*.