Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tue van cong snippets" » "tue van dong snippets", "tue van phong snippets", "tue phan cong snippets", "que van cong snippets", "te van cong snippets", "tue va 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: (((("tue 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: (((("tue van cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tue van cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tue van cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.