Perhaps you should try some spelling variations:
"van thu java snippets" » "van ngu java snippets", "van thu va snippets", "van thu java slippers"
"dung cuc code snippets" » "dung cua code snippets", "dung cu code snippets", "dung cac code snippets", "dung cfd code snippets", "dung cuc code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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 thu java snippets") or ("dung cuc code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van thu java snippets") OR ("dung cuc code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van thu java snippets ) or ( dung cuc code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van thu java snippets") or ("dung cuc code snippets"))) or ("locating bug code snippets"))*.