Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van nga cac snippets" » "van nghe cac snippets", "van ngoc cac snippets", "van nhan cac snippets", "van ngu cac snippets", "van ngan bac snippets", "van ngan can 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 nga cac 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 nga cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van nga cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van nga cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.