Perhaps you should try some spelling variations:
formen beim » reformen beim, formen im, forschen beim
iii formen » ii formen, die formen, iii form
david dang » david mant, david ng
yang yang » wang yang, wang yan
david ian » david a, david n
yan wang » yuan wang, qian wang, yan liang
yang iii » klang iii, yang zili, zwang iii

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: ((yan wang) OR (yang yang)) yang iii formen beim ((david dang) OR (david ian)) hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yan wang) OR (yang yang)) yang iii formen beim ((david dang) or (david ian)) hai ;~".
• Adding a wildcard symbol may retrieve word variants: ((yan wang) OR (yang yang)) yang iii formen beim ((david dang) or (david ian)) hai ;*.