Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
tu sach » thu sach, su sach, te sach
dac ban » cac ban, duc ban, da ban
tai cua » thai cua, tai cuc, tri cua
dac san » dac sac, cac san, dac nhan
van bac » van ban, van bao, van hac
van cac » van hac, van cau, 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: tu sach y nang x hoi. hieu ((van cac) or (van bac)) ((dac ban) OR (dac san)) thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ((van cac) OR (van bac)) ((dac ban) OR (dac san)) thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu ((van cac) or (van bac)) ((dac ban) OR (dac san)) thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ((van cac) or (van bac)) ((dac ban) OR (dac san)) thanh tai cua tre*.