Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van trung do snippets" » "van truong do snippets", "va trung do snippets", "san trung do snippets", "van trung bo snippets", "van trung co snippets", "van trung du 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 trung do 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 trung do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van trung do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van trung do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.