Perhaps you should try some spelling variations:
dang xay » dang van, van xay
thanh vi » thanh va, thanh ve, nhanh vi
nam thuc » nam thuoc, am thuc, nam thu
hieu le » hieu ve, hieu he, hieu ly
lang xa » lang ha, lang van
vu cac » va cac, tu cac, ve cac
le nam » ly nam, he nam, le na
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu cac ky ((lang xa) or (dang xay)) hoi. hieu le nam thuc vat ((thanh vi) OR (hanh vi)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu cac ky ((lang xa) OR (dang xay)) hoi. hieu le nam thuc vat ((thanh vi) OR (hanh vi)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu cac ky ((lang xa) or (dang xay)) hoi. hieu le nam thuc vat ((thanh vi) OR (hanh vi)) cua tu".
• Adding a wildcard symbol may retrieve word variants: vu cac ky ((lang xa) or (dang xay)) hoi. hieu le nam thuc vat ((thanh vi) OR (hanh vi)) cua tu*.