Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ban van cong snippets" » "ban van dong snippets", "ban van phong snippets", "ban phan cong snippets", "ban dan cong snippets", "ban va cong snippets", "tan van cong 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: (((("ban van cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ban van cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ban van cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ban van cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.