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