Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tao thiet » tai thiet, tay thiet, toan thiet
hanh tran » hanh trang, thanh tran, hanh tram
dung cong » dung trong
tran van » luan van
van dung » van dong, xay dung, tin dung
tran ban » tranh ban, tran bai, tran tan
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) or (tao thiet)) tach - hanh tran van dung cong thanh ((tran ban) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (tao thiet)) tach - hanh tran van dung cong thanh ((tran ban) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) or (tao thiet)) tach - hanh tran van dung cong thanh ((tran ban) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (tao thiet)) tach - hanh tran van dung cong thanh ((tran ban) OR (toan ban))*.