Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
huong cua » dung cua
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban
cong cu » chung cu

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 ((cong cu) or (huong cua)) dung cong tan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh ((cong cu) OR (huong cua)) dung cong tan toan tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh ((cong cu) or (huong cua)) dung cong tan toan tap*.