Perhaps you should try some spelling variations:
thuong dong » phuong dong, tuong dong, chuong dong
thuong con » truong cong, thong cong, thuong chi
hoa chinh » hoan chinh, hoa hinh, hoc chinh
tranh cua » doanh cua, manh cua
ho chinh » hoc chinh, cho chinh, do chinh
bai toan » bai tap
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chinh) OR (hoa chinh)) sach - canh tranh cua ((thuong con) or (thuong dong)) bai toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chinh) OR (hoa chinh)) sach - canh tranh cua ((thuong con) OR (thuong dong)) bai toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chinh) OR (hoa chinh)) sach - canh tranh cua ((thuong con) or (thuong dong)) bai toan tap".
• Adding a wildcard symbol may retrieve word variants: ((ho chinh) OR (hoa chinh)) sach - canh tranh cua ((thuong con) or (thuong dong)) bai toan tap*.