Perhaps you should try some spelling variations:
toan dinh » tran dinh, toan kinh, doan dinh
khien hoc » nhiet hoc
khach xin » khach san
dinh cac » tinh cach, dinh chuc, dinh chau
dien hoc » dien hoa, tin hoc, lieu hoc
vu khach » vu khanh, vu khac, vay khach
cac khoa » cac khoan, cac khoi, dac khoa
khoa hoc » hoa hoc
xin cac » tin cac, gian cac, vien cac

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 khach xin 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 khach xin cac khoa hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thuat toan dinh cac ((khien hoc) or (dien hoc)) ) or ( vu khach xin cac khoa hoc ))*.