Perhaps you should try some spelling variations:
"chung phi cong snippets" » "chung phi code snippets", "chung chi cong snippets", "chung vi cong snippets", "xung phi cong snippets", "chung thi cong snippets", "chung phan cong snippets", "chung pham 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 ("chung phi 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 ("chung phi cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( chung phi cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("chung phi cong snippets"))) or ("locating bug core snippets"))*.