Perhaps you should try some spelling variations:
"tran dung san slippers" » "tran dang san slippers", "tran hung san slippers", "tran quang san slippers", "tran dong san slippers", "tran dung sai slippers", "tran dung luan slippers", "tran dung san slippery", "tran dung san grippers"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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 dung san slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran dung san slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tran dung san slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran dung san slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.