Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van moi cho snippets" » "van muoi cho snippets", "van loi cho snippets", "ban moi cho snippets", "van moi co snippets", "van hoi cho snippets", "van mo cho 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 moi cho 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 moi cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van moi cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van moi cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.