Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong sach te snippets" » "ong sach te snippets", "song sach te snippets", "duong sach te snippets", "cong sach tet snippets", "cong sach de snippets", "cong sach tu 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: (((("cong sach te snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong sach te snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong sach te snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong sach te snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.