Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
long doan » cong doan, dong doanh, rong doanh
trinh va » trinh van, trinh vat, trinh ve
va thanh » gia thanh, ban thanh, va tinh
long dan » nong dan, long van, dong dan
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 va thanh ((((long dan) OR (long doan))) or (cong dan)) khoa cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - canh trinh va thanh ((((long dan) OR (long doan))) OR (cong dan)) khoa cam.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien nhanh - canh trinh va thanh ((((long dan) OR (long doan))) or (cong dan)) khoa cam".
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - canh trinh va thanh ((((long dan) OR (long doan))) or (cong dan)) khoa cam*.