Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"may ket toan snippets" » "may ke toan snippets", "may ket doan snippets", "may kiem toan snippets", "may det toan snippets", "may keo 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: (((("may ket 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: (((("may ket toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( may ket toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("may ket toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.