Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa he so snippets" » "hoa he so snippets", "khoa hoc so snippets", "khong he so snippets", "khoa he soi snippets", "khoa he co snippets", "khoa ho so 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: (((("khoa he so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoa he so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa he so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa he so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.