Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
ban hang » ngan hang
nam quan » nam huan, sam quan, tam quan
hang di » hang doi, hang vi, hang dien
nam qua » nam cua, nam mua, nam xua
cua tre » cua te, cuu tre, cua triet
vu nang » vuc nang, va nang, vu dang
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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: thu sach ((y nang) OR (vu nang)) x hoi. thien van ((nam qua) OR (nam quan)) ban hang di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) or (vu nang)) x hoi. thien van ((nam qua) OR (nam quan)) ban hang di cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) or (vu nang)) x hoi. thien van ((nam qua) OR (nam quan)) ban hang di cua tre*.