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