Perhaps you should try some spelling variations:
ban thanh » ban hang
cham xuc » cam xuc, chat xuc, cham soc
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, mang may
cuu tre » cua tre, cau tren, cau treo
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: tu sach ky ((nang ma) or (nang cao)) hoi. hieu va cham xuc ((ban thanh) OR (ban hanh)) va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (nang cao)) hoi. hieu va cham xuc ((ban thanh) OR (ban hanh)) va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ma) or (nang cao)) hoi. hieu va cham xuc ((ban thanh) OR (ban hanh)) va cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (nang cao)) hoi. hieu va cham xuc ((ban thanh) OR (ban hanh)) va cuu tre*.