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)
"phat trien san kien." » "phat trien van kien." (Expand Search), "phat trien va kien." (Expand Search), "phat trien cac kien." (Expand Search), "phat trien su kien." (Expand Search), "pham trien san kien." (Expand Search)
"pha trien ben kien." » "phan trien ben kien." (Expand Search), "pha tren ben kien." (Expand Search), "pham triet ben kien." (Expand Search), "pha trien bien kien." (Expand Search), "pha trien ben lien." (Expand Search), "pha trien ben bien." (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 san kien.") OR ((("phap trien san kien.") OR ("pha trien ben kien."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"phat trien san kien.\") OR (((\"phap trien san kien.\") OR (\"pha trien ben kien.\"))))".
• Removing quotes may allow a broader search: (( phat trien san kien. ) OR ((( phap trien san kien. ) OR ( pha trien ben kien. )))).
• Adding a wildcard symbol may retrieve word variants: (("phat trien san kien.") OR ((("phap trien san kien.") OR ("pha trien ben kien."))))*.