Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien manh » hien hanh, tien manh, hien nhanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
tuong dan » huong dan, tung dan, xuong dan
xuong san » xuong song, cong san, dong san
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 ((hien manh) OR (hieu manh)) - thanh trung cua thong ((tuong dan) or (xuong san)) can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien manh) OR (hieu manh)) - thanh trung cua thong ((tuong dan) OR (xuong san)) can cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien manh) OR (hieu manh)) - thanh trung cua thong ((tuong dan) or (xuong san)) can cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien manh) OR (hieu manh)) - thanh trung cua thong ((tuong dan) or (xuong san)) can cau*.