Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh tram » hanh tam, hanh trang, thanh tran
van dung » van dong, tin dung
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - hanh tram ((van dung) OR (xay dung)) cong dan than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh tram ((van dung) OR (xay dung)) cong dan than cau*.