Perhaps you should try some spelling variations:
"tran quang hien." » "tran xuan hien." (Expand Search), "tran quang thien." (Expand Search), "tran quang huyen." (Expand Search), "tran quang thieu." (Expand Search), "trang quang hien." (Expand Search), "tran xuang hien." (Expand Search), "tran tuang hien." (Expand Search)
"tran quan hien." » "trang quan hien." (Expand Search), "tran xuan hien." (Expand Search), "tran tuan hien." (Expand Search), "tran quan huyen." (Expand Search), "tran quan he." (Expand Search), "tran van hien." (Expand Search)
"tran dan gian." » "tran dang gian." (Expand Search), "tranh dan gian." (Expand Search), "toan dan gian." (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("tran dan gian.") OR ((("tran quang hien.") OR ("tran quan hien."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"tran dan gian.\") OR (((\"tran quang hien.\") OR (\"tran quan hien.\"))))".
• Removing quotes may allow a broader search: (( tran dan gian. ) OR ((( tran quang hien. ) OR ( tran quan hien. )))).
• Adding a wildcard symbol may retrieve word variants: (("tran dan gian.") OR ((("tran quang hien.") OR ("tran quan hien."))))*.