Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cay phoi » cap phoi, tay hoi, cay cho
chua tre » chua tri, cua tre, chua trieu
ky dang » ky danh
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va chua » vua chua, ca chua, va chu
luc va » duc va, tuc va, loc va

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