Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach quan ho snippets" » "sach quang ho snippets", "sach luan ho snippets", "tac quan ho snippets", "sach quan he snippets", "sach quan ha snippets", "sach quan so 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 quan ho 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 quan ho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach quan ho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach quan ho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.