Perhaps you should try some spelling variations:
hien hanh » dieu hanh
tranh cua » doanh cua, manh cua
cua thong » cua thuong, cua khong, cua tong
cong sang » cong lang, cong vang, cong bang
khoan cam » khoa cam, khoan va, phan cam
thanh cac » hanh cac, thanh bac, thanh ca
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hanh - canh tranh cua thong ((cong san) or (cong sang)) ((khoan cam) or (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - canh tranh cua thong ((cong san) OR (cong sang)) ((khoan cam) OR (thanh cac)).
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - canh tranh cua thong ((cong san) or (cong sang)) ((khoan cam) or (thanh cac))*.