Perhaps you should try some spelling variations:
daizong » daizhong, daikong, daisong
dairong » bairong, kairong, hairong
haiyong » haiyang, haiying
hailong » hailing, headlong
tang » gang, tag, tan

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: emperor ((daizong OR dairong) OR (haiyong OR hailong)) of tang.
• The words AND, OR and NOT may confuse the search; try adding quotes: "emperor ((daizong or dairong) or (haiyong OR hailong)) of tang".
• Adding a wildcard symbol may retrieve word variants: emperor ((daizong or dairong) or (haiyong OR hailong)) of tang*.