Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hao van c1 snippets" » "dao van c1 snippets", "ho van c1 snippets", "cao van c1 snippets", "hao van ca snippets", "hao van co snippets", "hao van cu 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: (((("hao van c1 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hao van c1 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hao van c1 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hao van c1 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.