Perhaps you should try some spelling variations:
thanh trung » thanh tung
khong cang » thong cong, hong bang, khong dung
hiem ngan » kim ngan, viem gan
hieu manh » chieu xanh, hieu nganh, hien hanh
trung cua » truong cua, trung tuan, trung cap
cua khong » hua khong, cua phuong, cua thuong
cang dan » cong dan, tang dan, canh 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 ((hiem ngan) or (((hieu manh) OR (dieu hanh)))) - thanh trung cua khong cang dan can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hiem ngan) OR (((hieu manh) OR (dieu hanh)))) - thanh trung cua khong cang dan can cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hiem ngan) or (((hieu manh) OR (dieu hanh)))) - thanh trung cua khong cang dan can cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hiem ngan) or (((hieu manh) OR (dieu hanh)))) - thanh trung cua khong cang dan can cau*.