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