Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
van cam » van nam, van lam, van dam
hoi cua » hoi chuc
toc gia » toc giay, tac gia, quoc gia
van cau » van dau, van hau, van chat
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
so hoc » co hoc, mo hoc, so hoa
cua tu » cua tuc, cua su, cua cu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ((o hoi) or (so hoc)). hieu ((van cam) OR (van cau)) toc gia thanh hoi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((o hoi) OR (so hoc)). hieu ((van cam) OR (van cau)) toc gia thanh hoi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang ((o hoi) or (so hoc)). hieu ((van cam) OR (van cau)) toc gia thanh hoi cua tu".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((o hoi) or (so hoc)). hieu ((van cam) OR (van cau)) toc gia thanh hoi cua tu*.