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, dieu 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 chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh 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)) - thanh trung cua khong cang dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hiem ngan) OR (hieu manh)) - thanh trung cua khong cang dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hiem ngan) or (hieu manh)) - thanh trung cua khong cang dan chan cau*.