Perhaps you should try some spelling variations:
thanh trung » thanh tung
vien nganh » vien thanh
hieu xanh » chieu xanh, hieu manh, hieu nganh
trong san » trong cac, cong san, dong san
cap dong » cau dong, ca dong, cac dong
cao dong » cao dang, lao dong, cao cong
san van » tan van, luan van, tran van

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