Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh rung » thanh trung, thanh tung, thanh hung
ho chieu » theo chieu, hoc thieu, doi chieu
rung tap » rung tai, trung tam, trung cap
phan dau » hang dau
co cong » cao cong, cho cong, so cong
bo cong » so cong, cao cong, hoc cong

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh rung tap ((co cong) OR (bo cong)) van ((phan dau) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh rung tap ((co cong) OR (bo cong)) van ((phan dau) or (phan tu))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh rung tap ((co cong) OR (bo cong)) van ((phan dau) or (phan tu))*.