Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo tien » thuc tien, theo tcvn, tien tien
tang luan » dung luan
trung cua » truong cua, trung tuan, trung cap
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
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: ((theo tien) OR (theo tieu)) trinh - thanh ((tang luan) or (trung cua)) nhung cong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tien) OR (theo tieu)) trinh - thanh ((tang luan) OR (trung cua)) nhung cong bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo tien) OR (theo tieu)) trinh - thanh ((tang luan) or (trung cua)) nhung cong bai toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo tien) OR (theo tieu)) trinh - thanh ((tang luan) or (trung cua)) nhung cong bai toan cau*.