Perhaps you should try some spelling variations:
thanh dai » thanh tai, thanh dat, thanh oai
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
cua tre » cuu tre, cua triet, dua tren
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
dai ban » dai han, tai ban, di ban
van can » van canh, van ban, ban can
ty nang » ky nang, ty xang, ty hang
cua te » cua tu
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: tu sach ty nang x hoi. hieu van can dai ban ((thanh dai) OR (thanh hai)) ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu van can dai ban ((thanh dai) OR (thanh hai)) ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu van can dai ban ((thanh dai) OR (thanh hai)) ((cua tre) or (cua te))*.