Perhaps you should try some spelling variations:
truong cong » trong cong, truong dong, truong long
thiet tach » thien hach, thuat tach
chiet tach » chieu sach
duong cao » duong co, duong dao, luong cao
dung cao » dung cho, dung co, dung cac
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, ran cau

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 tach) OR (chiet tach)) - thanh ((dung cao) or (duong cao)) truong cong tan tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (chiet tach)) - thanh ((dung cao) OR (duong cao)) truong cong tan tran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) OR (chiet tach)) - thanh ((dung cao) or (duong cao)) truong cong tan tran cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) OR (chiet tach)) - thanh ((dung cao) or (duong cao)) truong cong tan tran cau*.