Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
hanh vai » hanh vi, hanh va, hanh tai
cua tren » dua tren, ca tren, cua tre
mai hoi » mai khoi, dai hoi, lai hoi
sach ky » sac ky, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
va cai » va cac, va bai, va dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sach y)) sang mai hoi. hieu ((va cai) or (ve cac)) xuc va hanh vai cua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) sang mai hoi. hieu ((va cai) OR (ve cac)) xuc va hanh vai cua tren.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach y)) sang mai hoi. hieu ((va cai) or (ve cac)) xuc va hanh vai cua tren*.