Perhaps you should try some spelling variations:
vien nganh » vien thanh
thanh tung » thanh cong
dong trong » duong trong, dung trong, cong trong
trong tran » trong trang, trong tranh, trong tan
hieu xanh » chieu xanh, hieu manh, hieu nganh
tran van » luan van
ca dong » cao dong, cau dong, cua dong

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 (vien nganh)) - ((thanh trung) OR (thanh tung)) ca dong trong tran van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (vien nganh)) - ((thanh trung) OR (thanh tung)) ca dong trong tran van ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (vien nganh)) - ((thanh trung) OR (thanh tung)) ca dong trong tran van ban*".