Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khen cao so snippets" » "khen ca so snippets", "khuyen cao so snippets", "khien cau so snippets", "khen cao son snippets", "khen co so snippets", "khen cao su 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: (((("khen cao 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: (((("khen cao so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khen cao so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khen cao so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.