Perhaps you should try some spelling variations:
hien manh » hien hanh, tien manh, hieu manh
trinh vat » trinh van, trinh luat, sinh vat
lang nong » hang nong, lang dong, lang song
trinh va » trinh van, trinh ve, trinh vi
nong dan » cong dan, nong san, nguong dan
dan phan » doan phan, dan chan, van phan
phan cac » nhan cach, phan dau, phan lap

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 vat)) lang nong dan phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien manh - canh ((trinh va) OR (trinh vat)) lang nong dan phan cac.
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - canh ((trinh va) or (trinh vat)) lang nong dan phan cac*.