Perhaps you should try some spelling variations:
nghien tach » nghiep cach, nghiep sach, nghiem sach
thanh trung » thanh tung
chap thuong » chan thuong, phan thuong, pham thuong
hoc nghien » hoc hien
cap thuong » ca thuong, cao thuong, cp thuong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nghien tach - thanh trung ((cap thuong) OR (chap thuong)) cong dan toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc nghien tach - thanh trung ((cap thuong) OR (chap thuong)) cong dan toan cao*.