Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh tram » hanh tam, hanh trang, thanh tra
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

You may be able to get more results by adjusting your search query.

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