Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dung » cua dang, cua dong, qua dung
tan toan » tap toan, van toan, dan toan
dan than » dan chan, ban than, van than

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 - thanh trung cua dung cong ((((tan toan) or (dan than))) or (tan tran)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - thanh trung cua dung cong ((((tan toan) OR (dan than))) OR (tan tran)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - thanh trung cua dung cong ((((tan toan) or (dan than))) or (tan tran)) tap*.