Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach van cho snippets" » "sach han cho snippets", "sach va cho snippets", "bach van cho snippets", "sach van chi snippets", "sach san cho snippets", "sach van chat 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 van cho 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 van cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach van cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach van cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.