Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
thanh tung » thanh cong
duong cong » dung cong, luong cong, duong trong
hieu xanh » chieu xanh, hieu manh, dieu hanh
tam duong » tam huong, tuan duong, thao duong
cong luan » tong luan, cong tuan, dong luan
luan phan » luan van, luan hoan
phan dau » phan tu, hang dau

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) OR (hieu nganh)) - ((thanh trung) or (thanh tung)) tam duong cong luan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu nganh)) - ((thanh trung) OR (thanh tung)) tam duong cong luan phan dau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu nganh)) - ((thanh trung) or (thanh tung)) tam duong cong luan phan dau*".