Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
trinh quan » trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
toan cau » toan cao, toan ban, toan tai
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: doc hieu nganh - hanh ((trinh quan) OR (tinh quang)) nhung cong san ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - hanh ((trinh quan) OR (tinh quang)) nhung cong san ((toan cau) OR (toan tap))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu nganh - hanh ((trinh quan) OR (tinh quang)) nhung cong san ((toan cau) or (toan tap))*".