Perhaps you should try some spelling variations:
trung dang » truong dang, trong dang, trung dong
trung dung » ung dung, trung uong, trinh dung
quang cong » quang cuong, quang dong, quang hoang
dan khoan » dan khoa, dai khoang, toan khoan
ho thiet » hoc thiet, hoa thiet, so thiet
ho chieu » theo chieu, hoc thieu, doi chieu
cong dan » cong san, cong tan, huong dan
khoan va » doan va, khoa ma, nhan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho thiet) or (ho chieu)) tach - thanh ((trung dang) OR (trung dung)) quang cong dan khoan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho thiet) OR (ho chieu)) tach - thanh ((trung dang) OR (trung dung)) quang cong dan khoan va*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) or (ho chieu)) tach - thanh ((trung dang) OR (trung dung)) quang cong dan khoan va*".