Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach han bo snippets" » "sach tham bo snippets", "sach danh bo snippets", "sach nang bo snippets", "sach phan bo snippets", "sach can bo snippets", "sach ban bo 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 han bo 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 han bo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach han bo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach han bo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.