Perhaps you should try some spelling variations:
phung cong » nhung cong, phong cong, nhung chong
hieu sach » chieu sach, hieu cach, hieu cac
dien sach » dien anh
tranh cua » doanh cua, manh cua
cua phung » cua phuong, cua nhung, cua chung
chinh cau » chinh chau, chinh can, chinh tai
cong dan » cong san, cong tan, huong dan
chinh ca » chinh ta, chinh va, chinh tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sach) or (dien sach)) - canh tranh cua phung cong dan ((chinh ca) or (chinh cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (dien sach)) - canh tranh cua phung cong dan ((chinh ca) OR (chinh cau)).
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (dien sach)) - canh tranh cua phung cong dan ((chinh ca) or (chinh cau))*.