Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"don than hoc snippets" » "don thuan hoc snippets", "dan than hoc snippets", "con than hoc snippets", "don toan hoc snippets", "don thai hoc snippets", "don than doc 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 than hoc 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 than hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( don than hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("don than hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.