Perhaps you should try some spelling variations:
vien thanh » viet thanh, tien thanh, dien thanh
canh manh » lanh manh, canh tranh, cach mang
nong cong » cong cong, tong cong, nang cong
ban thanh » ban hanh, ban hang
thanh cau » thanh chau, thanh mau, nhanh cau
manh cua » doanh cua, ban cua
cua nong » cua cong, cuu nong, cua dong
cong ban » cong bang, cong san, cong tan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((vien nganh) OR (vien thanh)) - canh manh cua nong cong ban thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((vien nganh) OR (vien thanh)) - canh manh cua nong cong ban thanh cau".
• Adding a wildcard symbol may retrieve word variants: doc ((vien nganh) OR (vien thanh)) - canh manh cua nong cong ban thanh cau*.