Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
chieu sach » chinh sach, chiet tach, chieu sang
tranh cua » manh cua
doanh cua » doanh luan
dong cong » duong cong, dung cong, dang cong
khoan cam » khoa cam, khoan va, phan cam
ho chieu » theo chieu, hoc thieu, doi chieu
khan ap » khan cap, han ap, khan dam

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 sach - canh ((tranh cua) or (doanh cua)) dong cong thanh ((khan ap) or (khoan cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - canh ((tranh cua) OR (doanh cua)) dong cong thanh ((khan ap) OR (khoan cam)).
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - canh ((tranh cua) or (doanh cua)) dong cong thanh ((khan ap) or (khoan cam))*.