Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
trinh phan » trinh han, trinh quan, thanh phan
phan thanh » pham thanh, ban thanh, van thanh
long dan » long doan, nong dan, long van
cong dan » cong san, cong tan, huong dan
khoa cam » khoan cam, khoa kham, khoa ma

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 nhanh - canh trinh phan thanh ((long dan) or (cong dan)) khoa cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - canh trinh phan thanh ((long dan) OR (cong dan)) khoa cam.
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - canh trinh phan thanh ((long dan) or (cong dan)) khoa cam*.