Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach pha du snippets" » "sach phat du snippets", "sach phap du snippets", "sach nha du snippets", "sach pham duc snippets", "sach pham duy snippets", "sach phan duc 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: (((("sach pha 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: (((("sach pha du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach pha du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach pha du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.