Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"don thi chap snippets" » "don thi phap snippets", "don thi cham snippets", "don thi cap snippets", "doan thi chap snippets", "dong thi chap snippets", "do thi chap 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: (((("don thi chap snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("don thi chap snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( don thi chap snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("don thi chap snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.