Perhaps you should try some spelling variations:
thiet danh » thien danh, thien anh, thien dang
hanh trinh » canh tranh, hanh chinh
nhung cong » thong cong, hang cong, nhung don
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trinh van » trinh han, trinh quan, trinh toan
dung cong » dung trong
van thanh » ban thanh, van tuan
thanh lap » thanh san, phan lap, thanh hai

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 - hanh trinh van ((nhung cong) OR (dung cong)) van thanh lap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet danh - hanh trinh van ((nhung cong) OR (dung cong)) van thanh lap".
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - hanh trinh van ((nhung cong) OR (dung cong)) van thanh lap*.