Perhaps you should try some spelling variations:
"cong doan hai snippets" » "cong dan hai snippets", "cong hoan hai snippets", "dong doanh hai snippets", "cong doanh tai snippets", "cong hoang hai snippets", "cong doan va snippets", "cong doan hai slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core 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 doan hai snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong doan hai snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong doan hai snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong doan hai snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.