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