Perhaps you should try some spelling variations:
"van chinh cac snippets" » "va chinh cac snippets", "van thinh cac snippets", "hanh chinh cac snippets", "van chinh ca snippets", "van chinh can snippets", "van chinh cau snippets"
"dung java java snippets" » "dung va java 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 cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van chinh cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van chinh cac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van chinh cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.