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