Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh tai » thanh toan, doanh tai, thanh san
thu sach » tu sach, thuat sach, thuoc sach
cac ban » cac dan, cac van, can ban
van hac » van hoc, van ha, van hai
van cac » van cau, van bac, dan cac
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu ((van cac) OR (van hac)) cac ban ((thanh tai) or (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu ((van cac) OR (van hac)) cac ban ((thanh tai) OR (thanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu ((van cac) OR (van hac)) cac ban ((thanh tai) or (thanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ((van cac) OR (van hac)) cac ban ((thanh tai) or (thanh hai)) cua tre*.