Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
long doan » cong doan, dong doanh, rong doanh
khoan cam » khoa cam, khoan va, phan cam
hoc dieu » hoc thieu, hoc hien
trinh ha » trinh han, trinh hoa, trinh nha
ha thanh » va thanh, pham thanh, phan thanh
long dan » cong dan, nong dan, long van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc dieu hanh - canh trinh ha thanh ((long dan) or (long doan)) khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu hanh - canh trinh ha thanh ((long dan) OR (long doan)) khoan cam.
• Adding a wildcard symbol may retrieve word variants: hoc dieu hanh - canh trinh ha thanh ((long dan) or (long doan)) khoan cam*.