Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
thang cua » thong cua, hang cua, than cua
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
tang cua » mang cua, hang cua, tang luan
cong san » cong tac
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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 - hanh ((thang cua) or (tang cua)) dung cong san ((than cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((thang cua) OR (tang cua)) dung cong san ((than cau) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((thang cua) or (tang cua)) dung cong san ((than cau) or (than cap))*.