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 toan » truong toan, trung tuan, trung tran
thong cong » trong cong, tong cong, thong thong
khoan cam » khoa cam, phan cam, thuan cam
cong dan » cong san, cong tan, huong dan
khoan va » doan va, khoa ma, nhan va

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