Perhaps you should try some spelling variations:
"cong lap cong snippets" » "cong lap code snippets", "cong luan cong snippets", "cong lang cong snippets", "cong tac cong snippets", "cong tap cong snippets", "cong lap dong snippets", "cong luat 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: (((("cong lap 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: (((("cong lap cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong lap cong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong lap cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.