Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van cham voi snippets" » "van chat voi snippets", "van tham voi snippets", "va cham voi snippets", "van cham hoi snippets", "van pham voi snippets", "van cham soc 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 cham 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 cham voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van cham voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van cham voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.