Perhaps you should try some spelling variations:
trung thanh » truong thanh
vien nganh » vien thanh
trung tuan » trung tam, tran tuan, truong thanh
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
cong dan » cong san, cong tan, huong dan
dan can » dan chan, dan canh, dan ca
can cau » van cau, ban cau, ca 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 ((hieu manh) or (vien nganh)) - thanh ((trung tuan) OR (trung thanh)) thong cong dan can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (vien nganh)) - thanh ((trung tuan) OR (trung thanh)) thong cong dan can cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (vien nganh)) - thanh ((trung tuan) OR (trung thanh)) thong cong dan can cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (vien nganh)) - thanh ((trung tuan) OR (trung thanh)) thong cong dan can cau*.