Perhaps you should try some spelling variations:
van thang » van thanh, van khang, van hang
thang hoi » thang loi, thong hoi, thanh hoai
su sach » so sach, vu sach
ky tang » ky dang, kho tang, ky trong
xuc van » duc van, luc van, vuc van
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky tang) OR (ky nang)) xa hoi. hieu ((ve cam) or (va cam)) xuc van thang hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (ky nang)) xa hoi. hieu ((ve cam) OR (va cam)) xuc van thang hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) OR (ky nang)) xa hoi. hieu ((ve cam) or (va cam)) xuc van thang hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) OR (ky nang)) xa hoi. hieu ((ve cam) or (va cam)) xuc van thang hoi cua tre*.