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