Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
hieu tach » hieu cach, chiet tach, chieu sach
trinh cua » tinh cua, trinh luat, trinh luan
cong cong » cong dong, trong cong, dung cong
cong nhan » cong nhat, cong thanh, cong san
nhan toan » nhat toan, thanh toan, nganh toan
doc hieu » toc thieu, hoc thieu, hoc hien
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: doc hieu tach - hanh ((trinh cua) or (trinh quan)) cong cong nhan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tach - hanh ((trinh cua) OR (trinh quan)) cong cong nhan toan cau*.