Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hoan ca snippets" » "van hoang ca snippets", "van hoa ca snippets", "van toan ca snippets", "van hoan cua snippets", "van hoan va snippets", "van hoang cao 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 hoan ca 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 hoan ca snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van hoan ca snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van hoan ca snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.