Perhaps you should try some spelling variations:
"nang luat cong snippets" » "nang luat code snippets", "nang suat cong snippets", "tang luat cong snippets", "nganh luat cong snippets", "nang thuat cong snippets", "nang luat chung snippets", "nang cua 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: (((("dung java java snippets") or ("nang luat cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("nang luat cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( nang luat cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("nang luat cong snippets"))) or ("locating bug core snippets"))*.