Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
hieu manh » chieu xanh, hieu nganh, dieu hanh
tang cong » tang cuong, trang cong, dang cong
manh toan » thanh toan, anh tuan, tinh toan
van than » van thanh, van thang, van tuan
cong ha » cong hoa, dong ha, cong tac
ha tang » phap tang, cao tang, kho tang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) or (hieu manh)) - thanh cong ha tang cong ((manh toan) or (van than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - thanh cong ha tang cong ((manh toan) OR (van than)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu manh)) - thanh cong ha tang cong ((manh toan) or (van than)) cao*.