Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van hang can snippets" » "van khang can snippets", "van hoang can snippets", "van thang can snippets", "van hang ban snippets", "van hang ca snippets", "van hang cau 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 hang can 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 hang can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van hang can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van hang can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.