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