Perhaps you should try some spelling variations:
hieu cach » hieu cac, chieu sach, hieu ca
tranh cua » doanh cua, manh cua
cua chong » cua cong, cua chung, cua khong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: hoc hieu cach - canh tranh cua chong ((cong dan) or (cong san)) chinh ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - canh tranh cua chong ((cong dan) OR (cong san)) chinh ca.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - canh tranh cua chong ((cong dan) or (cong san)) chinh ca*.