Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luc toan du snippets" » "duc toan du snippets", "quoc toan du snippets", "luc tai du snippets", "luc tran duc snippets", "luc 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: (((("luc 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: (((("luc toan du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luc toan du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luc toan du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.