Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi sach cap snippets" » "thi bach cap snippets", "thu sach cap snippets", "theo sach cap snippets", "thi sach dao snippets", "thi sach bai snippets", "thi sach xa 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: (((("thi sach cap snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi sach cap snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi sach cap snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi sach cap snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.