Perhaps you should try some spelling variations:
"dung can chan snippets" » "dung can code snippets", "dung cac chan snippets", "dung san chan snippets", "dung van chan snippets", "dung dan chan snippets", "dung cam chan snippets", "dung ban chan snippets"
"locating bug core snippets" » "locating bug code snippets"
"luong java java snippets" » "luong 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 can chan snippets") or ("luong java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung can chan snippets") OR ("luong java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung can chan snippets ) or ( luong java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung can chan snippets") or ("luong java java snippets"))) or ("locating bug core snippets"))*.