Perhaps you should try some spelling variations:
"hang truong ca snippets" » "hang thuong ca snippets", "tang truong ca snippets", "nang truong ca snippets", "hang truong cao snippets", "hang truong va snippets", "hang trong ca snippets"
"using java code snippets" » "using data code snippets", "using java core snippets"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs code snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java code snippets") or ("hang truong ca snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code snippets") OR ("hang truong ca snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java code snippets ) or ( hang truong ca snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") or ("hang truong ca snippets"))) or ("locating bug code snippets"))*.