Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
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: su sach ky nang x hoi. hieu van 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: su sach ky nang x hoi. hieu van dao ((duc ban) OR (dua ban)) thanh vai ((cua triet) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu van dao ((duc ban) OR (dua ban)) thanh vai ((cua triet) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu van dao ((duc ban) OR (dua ban)) thanh vai ((cua triet) or (cua te))*.