Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van man cong snippets" » "van mang cong snippets", "van van cong snippets", "van may cong snippets", "van manh cong snippets", "van ban cong snippets", "van han cong 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: (((("van man cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van man cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van man cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van man cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.