Perhaps you should try some spelling variations:
"dung tran xuan slippers" » "dung tren xuan slippers", "hung tran xuan slippers", "dang tran xuan slippers", "dung tran quang slippers", "dung tran van slippers", "dung tran xuan slippery", "dung tran xuan 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: (((("dung tran xuan slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung tran xuan slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tran xuan slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tran xuan slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.