Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach ty, sach kem
ca tren » cau tren, cu tren, la tren
mai hoi » mai khoi, dai hoi, lai hoi
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
ve cai » va cai, ve tai, ve cau
vi ca » vit ca, li ca, va ca

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