Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"van phan trac slippers" » "van phan tap slippers", "van phan cac slippers", "van phan tan slippers", "van phong trac slippers", "van thanh trac slippers", "luan phan trac slippers", "van phan trac slippery", "van phan trac grippers"
"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 java java snippets") or ("van phan trac slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("van phan trac slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( van phan trac slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("van phan trac slippers"))) or ("locating bug code snippets"))*.