Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung cua » truong cua, trung tuan, trung cap
tong cong » trong cong, cong cong, dung cong
cong bang » cuong bang, dong bang, hong bang
bang toan » bong toan, dang toan, bang thanh
doc hieu » toc thieu, hoc thieu, hoc hien
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: doc hieu xanh - thanh ((trung cua) or (tran quang)) tong cong bang toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - thanh ((trung cua) OR (tran quang)) tong cong bang toan ban*.