Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hang vai » hang va, hang tai, hang hai
ban hang » ngan hang
vuc nang » cuc nang, chuc nang, van nang
vai cua » dai cua, hai cua, lai cua
duc ban » duc tan, duc van, dua ban
lam duc » lam duoc, pham duc, nam duoc
vu nang » va nang, vu dang, v nang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((vu nang) OR (vuc nang)) xa hoi. ((lieu va) or (thien van)) lam duc ban hang vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((vu nang) OR (vuc nang)) xa hoi. ((lieu va) OR (thien van)) lam duc ban hang vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((vu nang) OR (vuc nang)) xa hoi. ((lieu va) or (thien van)) lam duc ban hang vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((vu nang) OR (vuc nang)) xa hoi. ((lieu va) or (thien van)) lam duc ban hang vai cua tre*.