Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien nhanh » hien hanh, thien thanh, dien thanh
tien thanh » tien thinh, tran thanh, den thanh
trung tuan » trung thanh, trung tam, tran tuan
thong cong » trong cong, tong cong, phong chong
dan khoan » dan khoa, dai khoang, toan khoan
khoan cam » khoa cam, khoan va, phan cam

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 (tien thanh)) - thanh trung tuan ((thong cong) OR (thong thong)) dan khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (tien thanh)) - thanh trung tuan ((thong cong) OR (thong thong)) dan khoan cam.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) or (tien thanh)) - thanh trung tuan ((thong cong) OR (thong thong)) dan khoan cam".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (tien thanh)) - thanh trung tuan ((thong cong) OR (thong thong)) dan khoan cam*.