Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, va hanh
cuu tre » cau tren, cau treo
nang xa » nang x, lang xa, nang ma
va cau » van cau, va cac, va dau

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 (dang xay)) hoi. lieu va cau truc va danh vai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (dang xay)) hoi. lieu va cau truc va danh vai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (dang xay)) hoi. lieu va cau truc va danh vai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (dang xay)) hoi. lieu va cau truc va danh vai ((cua tre) OR (cuu tre))*.