Perhaps you should try some spelling variations:
thanh tung » thanh cong
cong thanh » dong thanh, cong trinh, cong tan
thanh chan » thanh phan, thanh nhan, thanh cha
hoc thiet » hoc thieu, hoc thuyet, hoc hien
doi chieu » doc hieu, doi chi, ho chieu
dang cong » dung cong
tung cao » nung cao, truong cao, trung cap
chan cau » phan cau, can cau, chinh 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) or (doi chieu)) tach - thanh tung cao dang cong thanh chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (doi chieu)) tach - thanh tung cao dang cong thanh chan cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (doi chieu)) tach - thanh tung cao dang cong thanh chan cau*.