Perhaps you should try some spelling variations:
"da khoang van snippets" » "da hoang van snippets", "da khong van snippets", "da thong van snippets", "dai khoang van snippets", "tao khoang van snippets", "da khoa van snippets", "da khoang van slippers"
"using low java snippets" » "using low java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("da khoang van snippets") or ("using low java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("da khoang van snippets") OR ("using low java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( da khoang van snippets ) or ( using low java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("da khoang van snippets") or ("using low java snippets"))) or ("locating bug code snippets"))*.