Perhaps you should try some spelling variations:
vien nganh » vien thanh
tang cuong » nang luong
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh kho » trinh khoa, trinh khoi, trang cho
cuong van » duong van, luong van, muong van
van thanh » ban thanh, van tuan
thanh cau » thanh chau, thanh mau, nhanh cau
kho tang » cao tang

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)) - canh tranh kho tang cuong van thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (vien nganh)) - canh tranh kho tang cuong van thanh cau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (vien nganh)) - canh tranh kho tang cuong van thanh cau*.