Perhaps you should try some spelling variations:
yang guang » yang yang, yang liang
pham thai » pham thi
yan guan » gan guan, yan yuan, yihan guan
tan ying » fan ying, ran ying, tan yang
ying duc » tung duc, ying hua
phan hai » khan hadi, shang hai, phan thi
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang hyoung ((yan guan) or (yang guang)) tan ying duc ((phan hai) OR (pham thai)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang hyoung ((yan guan) OR (yang guang)) tan ying duc ((phan hai) OR (pham thai)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang hyoung ((yan guan) or (yang guang)) tan ying duc ((phan hai) OR (pham thai)) ;*".