Perhaps you should try some spelling variations:
yang dewen » wang dewen, yang dean
wang yang » wang yan, wang liang, wang yanling
shang jen » shang jin
shang hai » shang kai, dang hai, chang ha
song seo » hong seo, song seng, kong sek
hu yong » au yong, hu hong, zhu nong
song so » song von

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: wang yang dewen hu yong ((shang jen) OR (shang hai)) ((song seo) OR (song so)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang dewen hu yong ((shang jen) or (shang hai)) ((song seo) OR (song so)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yang dewen hu yong ((shang jen) or (shang hai)) ((song seo) OR (song so)) ;*.