Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
manh trung » manh tung, thanh trung, manh hung
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
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) OR (chiet tach)))) - manh trung cua nhung cong dang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (((chieu sach) OR (chiet tach)))) - manh trung cua nhung cong dang van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (((chieu sach) OR (chiet tach)))) - manh trung cua nhung cong dang van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (((chieu sach) OR (chiet tach)))) - manh trung cua nhung cong dang van ban*.