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