Perhaps you should try some spelling variations:
hoach dinh » hoang dinh
toan giao » ton giao, toan cao, hoa giao
te hoach » ke hoach, thu hoach, te hoc
te mach » ke mach, te sach, tim mach
tich su » lich su, tich du, tich so
so giao » so giai, hoc giao
dinh su » dinh so, hinh su, dinh cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te mach tich su - so giao ) or ( te hoach dinh su - toan giao ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te mach tich su - so giao ) OR ( te hoach dinh su - toan giao ))*.