Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sang mai » sang ma, sang tai, lang mai
hanh vai » hanh vi, hanh tai, hanh van
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
la tren » loai tren, dua tren, dat tren
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
ve cai » va cai, ve tai, ve cau
xuc va » duc va, tuc va, luc va
ve cac » va cac, vien cac

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 sang mai hoi. hieu ((ve cai) or (ve cac)) xuc va ((hanh vai) OR (hanh va)) la tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky sang mai hoi. hieu ((ve cai) OR (ve cac)) xuc va ((hanh vai) OR (hanh va)) la tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky sang mai hoi. hieu ((ve cai) or (ve cac)) xuc va ((hanh vai) OR (hanh va)) la tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky sang mai hoi. hieu ((ve cai) or (ve cac)) xuc va ((hanh vai) OR (hanh va)) la tren*.