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