Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phap viet ca snippets" » "phap viet ha snippets", "phap viet co snippets", "phap viet a snippets", "phan viet ca snippets", "pham viet ca 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: (((("phap viet ca snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phap viet ca snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phap viet ca snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phap viet ca snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.