Perhaps you should try some spelling variations:
"tran tranh giang." » "tran thanh giang." (Expand Search), "tran tran giang." (Expand Search), "tran trinh giang." (Expand Search), "tan tranh 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)
"quan van giang." » "quan va giang." (Expand Search), "quan tuan giang." (Expand Search), "quan tran giang." (Expand Search), "luan van giang." (Expand Search), "quan hoan 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 van giang.") OR ("tran tranh giang."))) OR ("quan van giang."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"tran van giang.\") OR (\"tran tranh giang.\"))) OR (\"quan van giang.\"))".
• Removing quotes may allow a broader search: (((( tran van giang. ) OR ( tran tranh giang. ))) OR ( quan van giang. )).
• Adding a wildcard symbol may retrieve word variants: (((("tran van giang.") OR ("tran tranh giang."))) OR ("quan van giang."))*.