Perhaps you should try some spelling variations:
thiet danh » thien danh, thien dang, tiep danh
thien anh » thien danh, tien anh, thien thanh
cua trung » cua truong, xuan trung, cua nhung
anh tang » anh bang, anh dang, anh nang
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thiet danh) OR (thien anh)) - anh tang ((cay trong) or (cua trung)) cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet danh) OR (thien anh)) - anh tang ((cay trong) OR (cua trung)) cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet danh) OR (thien anh)) - anh tang ((cay trong) or (cua trung)) cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet danh) OR (thien anh)) - anh tang ((cay trong) or (cua trung)) cong san toan cau*.