Perhaps you should try some spelling variations:
vien thanh » viet thanh, dien thanh, thien thanh
tien thanh » tien thinh, tran thanh, den thanh
thanh tung » thanh cong
thong cong » trong cong, tong cong, thong thong
cua thong » cua thuong, cua khong, cua tong
tung cua » trung cua, tuong cua, dung cua
cong van » cong vang, cong san, song van
than cap » thanh lap, thanh cac, than cua
khan cap » khan ap, khoan cam, phan cac

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 thanh) or (tien thanh)) - thanh tung cua thong cong van ((than cap) OR (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((vien thanh) OR (tien thanh)) - thanh tung cua thong cong van ((than cap) OR (khan cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((vien thanh) or (tien thanh)) - thanh tung cua thong cong van ((than cap) OR (khan cap))".
• Adding a wildcard symbol may retrieve word variants: doc ((vien thanh) or (tien thanh)) - thanh tung cua thong cong van ((than cap) OR (khan cap))*.