Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh cua » trinh luat, trinh quan, trinh luan
dong cong » duong cong, dung cong, dang cong
cong dang » cong dong, cong dan, cong dung
tinh cua » sinh cua, tinh chat, tranh cua
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: ho ((hieu manh) or (chiet tach)) - hanh ((trinh cua) OR (tinh cua)) dong cong dang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (chiet tach)) - hanh ((trinh cua) OR (tinh cua)) dong cong dang van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chiet tach)) - hanh ((trinh cua) OR (tinh cua)) dong cong dang van ban".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chiet tach)) - hanh ((trinh cua) OR (tinh cua)) dong cong dang van ban*.