Perhaps you should try some spelling variations:
tang tang » taizong tang
tang liu » tang li, dong liu, tang jie
liu yuan » liu yan, liu jiyuan, liu yu
yuan zi » yan zi, yuan li, yuan fei
zi yang » yi yang, liu yang, hui yang
yu fang » yu gang, yu wang, yu yang
li gang » liu gang, ii gang, i gang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tang tang liu yuan zi yang ((yu fang) or (li gang)) zheng ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tang tang liu yuan zi yang ((yu fang) OR (li gang)) zheng ;*.