Perhaps you should try some spelling variations:
nghien tach » nghiep cach, nghiem sach, nghiep thanh
nghiep sach » nghiep cach, nghiep bac, nghiep thanh
thanh trung » thanh tung
thuong cong » thong cong, thuong con, thuong dong
cua thuong » cua truong, cua phuong, ca thuong
trung cua » truong cua, trung tuan, trung cap
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((nghien tach) or (nghiep sach)) - thanh trung cua thuong cong dan ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((nghien tach) OR (nghiep sach)) - thanh trung cua thuong cong dan ((toan cao) OR (toan ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((nghien tach) or (nghiep sach)) - thanh trung cua thuong cong dan ((toan cao) OR (toan ban))*".