Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh va » thanh van, hanh va, thanh ha
nam thuc » nam thuoc, am thuc, nam thu
tu sach » thu sach, su sach, te sach
nam xuc » cam xuc, nam xua, nam duoc
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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 ((ky sang) or (ky dang)) ma hoa. lieu va ((nam xuc) OR (nam thuc)) ban thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (ky dang)) ma hoa. lieu va ((nam xuc) OR (nam thuc)) ban thanh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) or (ky dang)) ma hoa. lieu va ((nam xuc) OR (nam thuc)) ban thanh va cua tre*".