Perhaps you should try some spelling variations:
thiet danh » thien danh, thien anh, thien dang
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
ha nhung » hoa nhung, hay nhung, pha nhung
cong san » cong tac
doan cau » toan cau, doan cap, doanh chau
doan dau » doan dieu, phan dau, doan va

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 trung) or (thanh tung)) ha nhung cong san ((doan cau) or (doan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet danh - ((thanh trung) OR (thanh tung)) ha nhung cong san ((doan cau) OR (doan dau)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - ((thanh trung) or (thanh tung)) ha nhung cong san ((doan cau) or (doan dau))*.