Perhaps you should try some spelling variations:
manh nhanh » danh nhan, anh nhan, danh thanh
nhanh thi » nhanh thai, nhanh thuc, nhan tai
duc manh » suc manh, duc anh, duc minh
tu sach » thu sach, su sach, te sach
van hau » van ha, van hai, van dau
thi cua » thai cua, thi cuc, tri cua
van cau » van dau, van chat, toan cau
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
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: tu sach ty nang ((o hoi) or (co hoc)). hieu ((van cau) OR (van hau)) duc manh nhanh thi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((o hoi) OR (co hoc)). hieu ((van cau) OR (van hau)) duc manh nhanh thi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((o hoi) or (co hoc)). hieu ((van cau) OR (van hau)) duc manh nhanh thi cua tre*".