Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien quan » thien quan, lien quan, vien quan
tranh cua » doanh cua, manh cua
tang cua » mang cua, hang cua, tang luan
cong san » cong tac
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien quan - hanh ((tranh cua) or (tang cua)) nhung cong san ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien quan - hanh ((tranh cua) OR (tang cua)) nhung cong san ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien quan - hanh ((tranh cua) or (tang cua)) nhung cong san ((toan cau) or (toan ban))*.