Perhaps you should try some spelling variations:
"nhat trien thai hoc" » "phat trien thai hoc", "nhat tien thai hoc", "chat thien thai hoc", "nhat trien khai hoc", "nhat trien thi hoc", "nhat trien thanh hoc", "nhat trien dai hoc", "nhat trien bai hoc", "nhat trien hoi hoc"
"phap trien thai hoc" » "phap trien khai hoc", "phap trien thi hoc", "phap trien thanh hoc", "phat trien thai hoc", "phap truyen thai hoc", "phap tieng thai hoc", "phap trien dai hoc", "phap trien bai hoc", "phap trien hoi hoc"
"pham trien khoa hoc" » "phat trien khoa hoc", "pham tien khoa hoc", "pham tren khoa hoc", "pham trien nha hoc", "pham trien khai hoc", "pham trien hoat hoc", "pham trien hoa hoc"

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: (((("nhat trien thai hoc") or ("phap trien thai hoc"))) or ("pham trien khoa hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhat trien thai hoc") OR ("phap trien thai hoc"))) OR ("pham trien khoa hoc")).
• Removing quotes may allow a broader search: (((( nhat trien thai hoc ) or ( phap trien thai hoc ))) or ( pham trien khoa hoc )).
• Adding a wildcard symbol may retrieve word variants: (((("nhat trien thai hoc") or ("phap trien thai hoc"))) or ("pham trien khoa hoc"))*.