Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doc hai toan snippets" » "doc bai toan snippets", "doc hai tan snippets", "doc hach toan snippets", "hoc hai toan snippets", "do hai toan snippets", "duc hai toan 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: (((("doc hai toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doc hai toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc hai toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc hai toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.