Perhaps you should try some spelling variations:
thiet danh » thien danh, thien anh, thien dang
thanh tung » thanh cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cua khong » hua khong, cua phuong, cua thuong
tung cua » trung cua, tuong cua, dung cua
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
hang cau » hang ca, nhung cau, nang cao
hang dau » hang va, hang tai

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 - thanh tung cua khong ((cong tan) OR (cong san)) ((hang cau) or (hang dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet danh - thanh tung cua khong ((cong tan) OR (cong san)) ((hang cau) OR (hang dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet danh - thanh tung cua khong ((cong tan) OR (cong san)) ((hang cau) or (hang dau))".
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - thanh tung cua khong ((cong tan) OR (cong san)) ((hang cau) or (hang dau))*.