Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
doi tuong » moi truong, doi song
cong lang » cong vang, cong luong, cong quang
hoc hieu » hoc thieu, hoc hien, doc hieu
tung doi » tuong doi, dung doi, vung doi
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 - thanh tung doi tuong ((cong van) or (cong lang)) quang nam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - thanh tung doi tuong ((cong van) OR (cong lang)) quang nam.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - thanh tung doi tuong ((cong van) or (cong lang)) quang nam*.