Perhaps you should try some spelling variations:
thanh khung » thanh hung, thanh chuong, thanh phuong
hoan chinh » hanh chinh, hoa hinh
hoc chinh » hoc sinh, hoc kinh
khung cua » chung cua, khung luan, chung cu
cua thong » cua thuong, cua khong, cua tong
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chinh) OR (hoan chinh)) sach - thanh khung cua thong ((cong tan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chinh) OR (hoan chinh)) sach - thanh khung cua thong ((cong tan) OR (cong san)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chinh) OR (hoan chinh)) sach - thanh khung cua thong ((cong tan) or (cong san)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc chinh) OR (hoan chinh)) sach - thanh khung cua thong ((cong tan) or (cong san)) toan cau*.