Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien nhanh » hien hanh, thien thanh, tien thanh
tran thanh » ban thanh, van thanh, quan thanh
trung tuan » trung thanh, trung tam, tran tuan
tuan thong » toan thong, tran thong, tuan phong
thong cong » trong cong, tong cong, thong thong
dan khoan » dai khoang, toan khoan, cac khoan
dan khoa » dang khoa, da khoa, san khoa

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