Perhaps you should try some spelling variations:
doanh vang » doanh van, doanh sang, doanh quang
vang cua » mang cua, hang cua, tang cua
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
tu sach » thu sach, su sach, te sach
ve tham » va tham, ve cham, vi tham
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang xa) or (lang xa)) hoi. hieu ve tham ((thuc va) OR (thuc day)) doanh vang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (lang xa)) hoi. hieu ve tham ((thuc va) OR (thuc day)) doanh vang cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (lang xa)) hoi. hieu ve tham ((thuc va) OR (thuc day)) doanh vang cua tre*".