Perhaps you should try some spelling variations:
"dung pham chieu snippets" » "dung pham code snippets", "dung phan hieu snippets", "dung pham hiep snippets", "dung phap hieu snippets", "dung phan chieu snippets", "hung pham chieu snippets", "tung pham chieu snippets"
"locating bug core snippets" » "locating bug code snippets"
"hang java java snippets" » "hang 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: (((("dung pham chieu snippets") or ("hang java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung pham chieu snippets") OR ("hang java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung pham chieu snippets ) or ( hang java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung pham chieu snippets") or ("hang java java snippets"))) or ("locating bug core snippets"))*.