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)
"luan van giang." » "luan tuan giang." (Expand Search), "luan tran giang." (Expand Search), "luan dan gian." (Expand Search), "quan van giang." (Expand Search)
"tran va giang." » "tran ha giang." (Expand Search), "tran bai giang." (Expand Search), "tran bac giang." (Expand Search), "tran van giang." (Expand Search), "tran ba giang." (Expand Search), "tran vu giang." (Expand Search)

Try widening your search to All Fields.

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

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