Perhaps you should try some spelling variations:
"dan dung code snippets" » "dan dung cong snippets", "dan dung co snippets", "dan dung de snippets", "van dung code snippets", "tin dung code snippets", "ap dung code snippets"
"locating bug core snippets" » "locating bug code snippets"
"hanh va java snippets" » "hang va java snippets", "hanh vi java snippets", "hanh java 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: (((("hanh va java snippets") or ("dan dung code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh va java snippets") OR ("dan dung code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( hanh va java snippets ) or ( dan dung code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh va java snippets") or ("dan dung code snippets"))) or ("locating bug core snippets"))*.