Perhaps you should try some spelling variations:
thanh khoan » thanh hoa, thanh toan, thanh phan
nhung cong » dung cong, thong cong, hang cong
cong thanh » dong thanh, cong trinh, cong tan
doi chieu » doc hieu, doi chi, mot chieu
trung dap » trung cap, trung dai, trung lap
trung dam » trung tam, trung dai, trong dam
khoan cam » khoa cam, khoan va, phan cam
ho chieu » theo chieu, hoc thieu, mot chieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (ho chieu)) sach - thanh ((trung dap) or (trung dam)) nhung cong thanh khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) sach - thanh ((trung dap) OR (trung dam)) nhung cong thanh khoan cam.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (ho chieu)) sach - thanh ((trung dap) or (trung dam)) nhung cong thanh khoan cam".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (ho chieu)) sach - thanh ((trung dap) or (trung dam)) nhung cong thanh khoan cam*.