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