Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nen sach doi snippets" » "ngan sach doi snippets", "dien sach doi snippets", "kien sach doi snippets", "nen sach hoi snippets", "nen sach moi snippets", "nen sach dao 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: (((("nen sach doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nen sach doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nen sach doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nen sach doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.