Perhaps you should try some spelling variations:
manh nhanh » danh nhan, anh nhan, danh thanh
nhanh tri » nhanh thi, thanh tri, nhanh thai
duc manh » suc manh, duc anh, duc minh
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
hieu va » lieu va, hieu qua
cau duc » cao duc, cau luc, chu duc
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
va cau » van cau, va cac, va dau
o hoi » o hoc, o hai, 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 tu nang ((o hoi) or (co hoi)). hieu va cau duc manh nhanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ((o hoi) OR (co hoi)). hieu va cau duc manh nhanh tri cua tre*.