Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"dung he chat snippets" » "dung he code snippets", "dung cho chat snippets", "dung ve chat snippets", "dung te chat snippets", "dung nghe chat snippets"
"dung using java snippets" » "dung ung java snippets", "dung sinh java snippets", "dung uong java snippets", "dung using data 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 he chat snippets") or ("dung using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung he chat snippets") OR ("dung using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung he chat snippets ) or ( dung using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung he chat snippets") or ("dung using java snippets"))) or ("locating bug core snippets"))*.