Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
thanh phan » thanh pho, thanh san, thanh toan
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, mot chieu
bang xay » dang xay, bang may, van xay
bang tay » ban tay, bang may, mang tay

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

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