Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
truc gia » truc giac, tuc gia, thuc giai
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky dang, ky tang, duy sang
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai

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: tu sach ((ky sang) OR (ky nang)) mai hoi. hieu ((ve cam) OR (ve cac)) truc gia thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) or (ky nang)) mai hoi. hieu ((ve cam) OR (ve cac)) truc gia thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) or (ky nang)) mai hoi. hieu ((ve cam) OR (ve cac)) truc gia thanh vai cua tre*.