Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh tai, hanh van
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
hanh va » hang va, hanh vi
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 van cam 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 van cam xuc va ((hanh vai) OR (hanh va)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang mai hoi. hieu van cam xuc va ((hanh vai) or (hanh va)) cau tren*.