Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh trung » thanh tung
hien nhanh » hien hanh, tien thanh, dien thanh
thong cong » trong cong, thong thong, phong chong
trung cua » truong cua, trung tuan, trung cap
tong cong » trong cong, cong cong, dung cong
ban thanh » ban hanh, ban hang
thanh cau » thanh chau, thanh mau, nhanh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien nhanh) or (thien thanh)) - thanh trung cua ((thong cong) OR (tong cong)) ban thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (thien thanh)) - thanh trung cua ((thong cong) OR (tong cong)) ban thanh cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) or (thien thanh)) - thanh trung cua ((thong cong) OR (tong cong)) ban thanh cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (thien thanh)) - thanh trung cua ((thong cong) OR (tong cong)) ban thanh cau*.