Perhaps you should try some spelling variations:
hien manh » hien hanh, tien manh, hieu manh
trinh van » trinh han, trinh quan, trinh toan
hang nong » thang long, han tong
trinh va » trinh vat, trinh ve, trinh vi
nong dan » cong dan, nong san, nguong dan
dan phan » doan phan, dan chan, van phan
phan dau » phan tu, hang dau

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