Perhaps you should try some spelling variations:
"trac hoc dat snippets" » "toan hoc dat snippets", "thai hoc dat snippets", "toc hoc dat snippets", "trac hoc dan snippets", "trac hoc dai snippets", "trac hoc phat snippets", "trac hoc dat slippers"
"dung va java snippets" » "dung java java snippets", "dung va java slippers"
"locating bug code snippets" » "locating bug code slippers", "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 va java snippets") or ("trac hoc dat snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung va java snippets") OR ("trac hoc dat snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung va java snippets ) or ( trac hoc dat snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung va java snippets") or ("trac hoc dat snippets"))) or ("locating bug code snippets"))*.