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