Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu xanh » chieu xanh, thien anh, thien danh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung qua » trung quan, trong qua, trung cua
qua dung » quang dung, su dung, qua song
cong ban » cong bang, cong tan, cong dan
cong san » cong tac
cung cu » chung cu, cung cua, cong cu

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 trung qua dung ((cong ban) OR (cong san)) cung cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - thanh trung qua dung ((cong ban) OR (cong san)) cung cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (hieu manh)) - thanh trung qua dung ((cong ban) OR (cong san)) cung cu".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu manh)) - thanh trung qua dung ((cong ban) OR (cong san)) cung cu*.