Perhaps you should try some spelling variations:
thanh trung » thanh tung
vien nganh » vien thanh
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung cua » truong cua, trung tuan, trung cap
trong dan » trong dang, trong tan, trong ban
trong san » trong cac, cong san, dong san
cua dong » chua dong, cua cong, cua dang
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) or (vien nganh)) - thanh trung cua dong ((trong dan) OR (trong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (vien nganh)) - thanh trung cua dong ((trong dan) OR (trong san)) toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (vien nganh)) - thanh trung cua dong ((trong dan) OR (trong san)) toan ban*".