Perhaps you should try some spelling variations:
thai cua » than cua, tai cuc, tri cua
ban thai » ban than, ban thi, ban tai
quoc ban » quoc bao, quoc lan, quoc quan
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
van hau » van ha, van hai, van dau
sach ky » sac ky, sach y, sach ty
cua te » cua tu
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 ky nang ((o hoi) or (o hai)). hieu van hau ((quoc ban) or (duc ban)) ban thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (o hai)). hieu van hau ((quoc ban) OR (duc ban)) ban thai cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (o hai)). hieu van hau ((quoc ban) or (duc ban)) ban thai cua te*.