Perhaps you should try some spelling variations:
dang xay » dang van, van xay
toc sach » hoc sach, doc sach, thuoc sach
dang cay » dang ca, dang cac, dung cay
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, tuc va, loc va
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty ((dang cay) OR (dang xay)) phoi. hieu ((van nam) or (van cau)) luc va hanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ((dang cay) OR (dang xay)) phoi. hieu ((van nam) OR (van cau)) luc va hanh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty ((dang cay) OR (dang xay)) phoi. hieu ((van nam) or (van cau)) luc va hanh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((dang cay) OR (dang xay)) phoi. hieu ((van nam) or (van cau)) luc va hanh va cuu tre*.