Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doan khac du snippets" » "doan hai du snippets", "doan hay du snippets", "doan khac di snippets", "doan khac do snippets", "doan khac duan snippets"
"locating bug code snippets" » "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: (((("doan khac du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doan khac du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doan khac du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doan khac du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.