Perhaps you should try some spelling variations:
yuan cheng » yuan chang, huang cheng, yu cheng
yan cheng » tan cheng, yan cong, yu cheng
wang yang » wang yan, wang liang, wang yanling
yan wang » yuan wang, yang yang, qian wang
das hai » das hal, das habt, das haus
yang i » yang di, yang xi, yang yi
i das » ii das, 1 das, 2 das

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((yan cheng) OR (yuan cheng)) yan wang yang i das hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yan cheng) OR (yuan cheng)) yan wang yang i das hai ;*".