Perhaps you should try some spelling variations:
"tran ban giang." » "tran bang giang." (Expand Search), "tran bai giang." (Expand Search), "tran bac giang." (Expand Search), "trang ban giang." (Expand Search), "tranh ban giang." (Expand Search), "tran lamn giang." (Expand Search), "tran main giang." (Expand Search)
"tran van giang." » "tran va giang." (Expand Search), "tran tuan giang." (Expand Search), "tran tran giang." (Expand Search), "luan van giang." (Expand Search), "san van giang." (Expand Search)
"tran ba giang." » "tran bai giang." (Expand Search), "tran bac giang." (Expand Search), "tran ha giang." (Expand Search), "tran lam giang." (Expand Search), "tran mai giang." (Expand Search)

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