Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
nhan hoi » nhan hoa, nhan hoc, nhan hop
van dau » van dao, phan dau
hoi cuu » hoi chu, hoi cua, ho cuu
va nhan » van nhan, ca nhan, va phan
te sach » toc sach
van cau » van hau, van chat, toan cau
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((mai khoi) or (dai hoi)). hieu ((van cau) OR (van dau)) duc va nhan hoi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((mai khoi) OR (dai hoi)). hieu ((van cau) OR (van dau)) duc va nhan hoi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((mai khoi) or (dai hoi)). hieu ((van cau) OR (van dau)) duc va nhan hoi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((mai khoi) or (dai hoi)). hieu ((van cau) OR (van dau)) duc va nhan hoi cuu tre*.