Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
vai cuu » vai cua
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van lam, van cau, van dam
ky sang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, xac va
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: tu sach ky sang mai hoi. hieu ((van cam) or (van nam)) ((xuc va) OR (luc va)) hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang mai hoi. hieu ((van cam) OR (van nam)) ((xuc va) OR (luc va)) hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang mai hoi. hieu ((van cam) or (van nam)) ((xuc va) OR (luc va)) hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang mai hoi. hieu ((van cam) or (van nam)) ((xuc va) OR (luc va)) hanh vai cuu tre*.