Perhaps you should try some spelling variations:
techniques paper » techniques upper, techniques peter, techniques pattern
basics technical » basic technical, basics techniques, devices technical
bias techniques » bias technique, biased techniques, beams techniques
world basics » world basic, word basics, world brics
world bias » world biases, world tobias, world beats

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( world bias techniques paper ) OR ( world basics technical papers )).
• Adding a wildcard symbol may retrieve word variants: (( world bias techniques paper ) or ( world basics technical papers ))*.