Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu van hoe snippets" » "thuc van hoe snippets", "thuy van hoe snippets", "tu van hoe snippets", "thu van hoa snippets", "thu van hoc snippets", "thu van hieu 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: (((("thu van hoe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thu van hoe snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu van hoe snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu van hoe snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.