Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
objective estimation » objective optimization, objective allocation
sach algorithm » search algorithm, graph algorithms, source algorithm
code dinh » co dinh, de dinh
dinh sach » sinh sach, tinh sach, chinh sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( modified objective estimation algorithms ) or ( code dinh sach algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified objective estimation algorithms ) OR ( code dinh sach algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( modified objective estimation algorithms ) or ( code dinh sach algorithm ))*.