Perhaps you should try some spelling variations:
"vi truong van snippets" » "vi trong van snippets", "vi truong va snippets", "vi truong dai snippets", "vi trung van snippets", "va truong van snippets", "vu truong van snippets", "vi truong van slippers"
"using low java snippets" » "using low java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

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