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