Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh vai » hanh vi, hanh tai, hanh van
cau tren » cu tren, dau tren, ca tren
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
ky sang » ky nang, ky dang, duy sang
hanh va » hang va, hanh vi
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao

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

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