Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"cong lang son snippets" » "cong lang code snippets", "cong vang son snippets", "cong luong son snippets", "cong quang son snippets", "cong nang song snippets", "cong bang song snippets", "cong anh son snippets"
"dung java java snippets" » "dung va java 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 ("cong lang son snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("cong lang son snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( cong lang son snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("cong lang son snippets"))) or ("locating bug core snippets"))*.