Perhaps you should try some spelling variations:
hoc thiet » hoc thieu, hoc thuyet, toc thieu
hanh tram » hanh tam, hanh trang, thanh tran
tram van » tran van, tam van, trang van
van dung » van dong, xay dung, tin dung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cau » toan cau, phan cau, than cap

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