Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
thien danh » thien anh, thien dang, thien thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh chu » trinh cau, trinh cho, trinh thuc
bang cong » dang cong, bang song, hang cong
chu bang » thu bang, chuc nang, chu quang
cong dan » cong san, cong tan, huong dan
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien danh) or (hieu manh)) - canh trinh chu bang cong dan ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (hieu manh)) - canh trinh chu bang cong dan ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien danh) or (hieu manh)) - canh trinh chu bang cong dan ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (hieu manh)) - canh trinh chu bang cong dan ((toan cau) OR (toan ban))*.