Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu manh » chieu xanh, hieu nganh, hien hanh
trung dan » trung dai, tung dan, trung van
dung cong » dung trong
van khanh » van thanh, van hanh, van anh
khanh cau » nhanh cau, thanh chau, hang cau
dan dung » van dung, tin dung, ap dung
cong van » cong vang, cong san, song van

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 (dieu hanh)) - thanh trung dan dung cong van khanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (dieu hanh)) - thanh trung dan dung cong van khanh cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (dieu hanh)) - thanh trung dan dung cong van khanh cau*.