Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van chinh so snippets" » "va chinh so snippets", "van thinh so snippets", "hanh chinh so snippets", "van chinh su snippets", "van chinh cho snippets", "van dinh so 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 chinh so 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 chinh so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van chinh so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van chinh so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.