Perhaps you should try some spelling variations:
hoach dinh » hoang dinh
te hoach » ke hoach, thu hoach, te hoc
ton giao » toan giao, hoc giao, don gian
te mach » ke mach, tim mach, tao mach
te sach » toc sach
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) OR (te sach)) tich su - so giao ) or ( te hoach dinh su - ton giao ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((te mach) OR (te sach)) tich su - so giao ) OR ( te hoach dinh su - ton giao ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((te mach) OR (te sach)) tich su - so giao ) or ( te hoach dinh su - ton giao ))*".