Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
hang cong » dang cong, hang nong, bang cong
cong dang » cong dong, cong dan, cong dung
dang van » hoang van, hang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (chieu sach)) - manh ((trung cua) OR (trung cap)) hang cong dang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu sach)) - manh ((trung cua) OR (trung cap)) hang cong dang van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (chieu sach)) - manh ((trung cua) OR (trung cap)) hang cong dang van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu sach)) - manh ((trung cua) OR (trung cap)) hang cong dang van ban*.