Perhaps you should try some spelling variations:
thinking losing » thinking long, thinking using, thinking leading
47 abstract » 4 abstract, 4.1 abstract, 4.0 abstract
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
sie sich » die sich, wie sich, die sicht
yang 47 » yang 4, yang 4.3
und » fund
ein » eine

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang wang yang 47 abstract thinking losing ((sie sich) or (und ein)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yang 47 abstract thinking losing ((sie sich) OR (und ein)) ;*.