Perhaps you should try some spelling variations:
thanh trung » thanh tung
thiet tach » chiet tach, thien hach, thuat tach
trung gian » truong giang, truong giao, trong giang
cong thanh » dong thanh, cong trinh, cong tan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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 - thanh trung gian trong cong thanh ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh trung gian trong cong thanh ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh trung gian trong cong thanh ((toan cau) or (toan ban))*.