Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
thong cua » thong quan, thong tu, huong cua
doc hieu » toc thieu, hoc thieu, hoc hien
tung cua » trung cua, tuong cua, dung cua
cong tan » cong tac, cong san, cong thanh
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 xanh - thanh ((tung cua) or (thong cua)) nhung cong tan ((toan cau) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh ((tung cua) OR (thong cua)) nhung cong tan ((toan cau) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh ((tung cua) or (thong cua)) nhung cong tan ((toan cau) or (van ban))*.