Perhaps you should try some spelling variations:
"truong xuan can snippets" » "truong quan can snippets", "truong luan can snippets", "truong quang can snippets", "truong xuan cang snippets", "truong xuan tan snippets", "truong xuan chanh snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("truong xuan can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("truong xuan can snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( truong xuan can snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("truong xuan can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.