Perhaps you should try some spelling variations:
"using bot cong snippets" » "using bot code snippets", "using both cong snippets", "using low cong snippets", "using sat cong snippets", "using bo cong snippets", "using mot cong snippets", "using bat cong snippets"
"locating bug core snippets" » "locating bug code 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: (((("using bot cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using bot cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using bot cong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using bot cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.