Perhaps you should try some spelling variations:
tang tang » taizong tang
tang fang » zhang fang, yang fan, jing fang
fang yuan » wang yuhan, wang yan, meng yuan
gain yang » dan yang, daun yang, yin yang
zhang hai » zhang dai, shang hai, zhang han
tan yang » dan yang, tan ying, tan yong
xi zhang » li zhang, xiao zhang, bin zhang

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: tang tang fang yuan ((gain yang) OR (tan yang)) xi zhang hai ;~.
• Adding a wildcard symbol may retrieve word variants: tang tang fang yuan ((gain yang) or (tan yang)) xi zhang hai ;*.