Perhaps you should try some spelling variations:
thieu hach » thien hach, hieu cach, thieu cac
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
cua nhung » va nhung
chinh cau » chinh chau, chinh ca, chinh can
cong dan » cong san, cong tan, huong dan
chan cau » phan cau, can cau, nhanh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu hach) or (chieu sach)) - canh tranh cua nhung cong dan ((chan cau) OR (chinh cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu hach) OR (chieu sach)) - canh tranh cua nhung cong dan ((chan cau) OR (chinh cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu hach) or (chieu sach)) - canh tranh cua nhung cong dan ((chan cau) OR (chinh cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu hach) or (chieu sach)) - canh tranh cua nhung cong dan ((chan cau) OR (chinh cau))*.