Perhaps you should try some spelling variations:
long trinh » long trip, long thanh
ching chen » china chen, ching hea, chin chin
chang chen » chang ch'un, chang chuan, change when
trinh tan » trinh xuan, trinh anh, tin tan
yang yun » yang jun, tang yun, yang yue
yun song » hyun song, yun young, jin song
shin » skin, sein, thin

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

• Performing a fuzzy search may retrieve terms with similar spellings: long trinh tan ((ching chen) or (chang chen)) yang yun song shin ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: long trinh tan ((ching chen) OR (chang chen)) yang yun song shin ;.
• Adding a wildcard symbol may retrieve word variants: long trinh tan ((ching chen) or (chang chen)) yang yun song shin ;*.