Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hien hanh » dieu hanh
nong dan » cong dan, nong san, nguong dan
dan hang » ban hang, van hang, dat hang
hang dau » hang va, hang tai
va nang » van nang, cam nang, kha nang
da nang » cam nang, kha nang, cao nang

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 trinh ((va nang) OR (da nang)) nong dan hang dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - canh trinh ((va nang) OR (da nang)) nong dan hang dau*".