Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
ban banh » ban hanh, ban anh, ban danh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
banh vi » hanh vi, ban vi, benh vi
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 ((x hoi) OR (o hoi)). hieu va cam xuc ban banh vi ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (o hoi)). hieu va cam xuc ban banh vi ((cua tre) OR (su triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((x hoi) OR (o hoi)). hieu va cam xuc ban banh vi ((cua tre) or (su triet))*".