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