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 cau » phan dau, phan cac, phan tu

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 cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien manh - canh ((trinh va) OR (trinh vat)) lang nong dan phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - canh ((trinh va) OR (trinh vat)) lang nong dan phan cau*.