Perhaps you should try some spelling variations:
"phap trien san kien." » "phan trien san kien." (Expand Search), "phap tien san kien." (Expand Search), "phap truyen san kien." (Expand Search), "phap trien van kien." (Expand Search), "phap trien va kien." (Expand Search), "phap trien cac kien." (Expand Search), "phap trien su kien." (Expand Search)
"pha trien san kien." » "pha trien van kien." (Expand Search), "pha trien va kien." (Expand Search), "pha trien cac kien." (Expand Search), "phan trien san kien." (Expand Search), "pha tren san kien." (Expand Search), "pham triet san kien." (Expand Search), "pha trien su kien." (Expand Search)
"phat trien ben kien." » "phat trien bien kien." (Expand Search), "phat trien ben lien." (Expand Search), "phat trien ben bien." (Expand Search), "pham trien ben kien." (Expand Search)

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: (("phat trien ben kien.") OR ((("phap trien san kien.") OR ("pha trien san kien."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"phat trien ben kien.\") OR (((\"phap trien san kien.\") OR (\"pha trien san kien.\"))))".
• Removing quotes may allow a broader search: (( phat trien ben kien. ) OR ((( phap trien san kien. ) OR ( pha trien san kien. )))).
• Adding a wildcard symbol may retrieve word variants: (("phat trien ben kien.") OR ((("phap trien san kien.") OR ("pha trien san kien."))))*.