Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu de » hieu ve, hieu he, hieu le
duc ban » duc tan, duc van, duc man
dua ban » dia ban, cua ban, qua ban
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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. hieu de dao ((duc ban) or (dua ban)) thanh vai ((cua triet) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu de dao ((duc ban) OR (dua ban)) thanh vai ((cua triet) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu de dao ((duc ban) or (dua ban)) thanh vai ((cua triet) or (cua te))*.