Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van dat hon snippets" » "van dao hon snippets", "van dau hon snippets", "dan dat hon snippets", "van doat hon snippets", "van dat phong snippets", "van dat hang 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 dat hon 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 dat hon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van dat hon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van dat hon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.