Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"liu yang doc snippets" » "liu ying doc snippets", "lijun yang doc snippets", "liu yaning doc snippets", "liu nang doc snippets", "liu dang do snippets", "liu dang duc 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: (((("liu yang doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("liu yang doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( liu yang doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("liu yang doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.