Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van cho voi snippets" » "van chi voi snippets", "san cho voi snippets", "van chat voi snippets", "van choi voi snippets", "van cho moi snippets", "van pho voi 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 cho voi 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 cho voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van cho voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van cho voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.