Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
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
tu sach » thu sach, su sach, te sach
ve cham » va cham, vu cham, ve chim
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
ve chat » va chat, van chat
xuc va » duc va, tuc va, luc 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 ((ve cham) OR (ve chat)) xuc va ((hanh vai) or (hanh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang mai hoi. hieu ((ve cham) OR (ve chat)) xuc va ((hanh vai) OR (hanh va)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang mai hoi. hieu ((ve cham) OR (ve chat)) xuc va ((hanh vai) or (hanh va)) cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang mai hoi. hieu ((ve cham) OR (ve chat)) xuc va ((hanh vai) or (hanh va)) cau tren*.