Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van toan noi snippets" » "van tuan noi snippets", "van tan noi snippets", "van thanh noi snippets", "van toan roi snippets", "van toan toi snippets", "van toan hoc 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 toan noi 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 toan noi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van toan noi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van toan noi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.