Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ve triet » va trien, su triet
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, ban hanh
hanh di » hanh vi, hanh de, hang di
qua ca » qua cac, qua cua, qua cai
ca dua » cay dua, ca cua, ca da
dua va » dua vao, vua va, sua va
x hoi » xa hoi, o hoi, x ho
di ve » dai ve, de ve, do ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang x hoi. hieu qua ca dua va hanh di ve triet~.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x hoi. hieu qua ca dua va hanh di ve triet*.