Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van phu do snippets" » "san phu do snippets", "van phung do snippets", "van phan do snippets", "van phu doi snippets", "van khu do snippets", "van phu da 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 phu 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 phu do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van phu do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van phu do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.