Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thuc day » thuc dan, thuc vat
dang xay » dang van, van xay
te sach » toc sach
thuc va » thuc vat, thuc dan
va cach » va cac
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((nang xa) or (dang xay)) hoi. hieu va cach ((thuc va) or (thuc day)) thanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (dang xay)) hoi. hieu va cach ((thuc va) OR (thuc day)) thanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) or (dang xay)) hoi. hieu va cach ((thuc va) or (thuc day)) thanh dai cua te*.