Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach han cao snippets" » "sach tham cao snippets", "sach danh cao snippets", "sach nang cao snippets", "sach han cho snippets", "sach han gao snippets", "sach hoang cao 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 cao 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 cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("sach han cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.