Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
van hanh » ban hanh, van anh, van ban
hieu ve » hieu va, hieu van
cac duc » cac du, cac dac, cac nuoc
sach ky » sac ky, sach y, sach ty
cao duc » dao duc, cao suc, giao duc
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su
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: toc sach ky nang x hoi. hieu ve ((cac duc) or (cao duc)) ((van hanh) OR (van thanh)) vi cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang x hoi. hieu ve ((cac duc) OR (cao duc)) ((van hanh) OR (van thanh)) vi cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang x hoi. hieu ve ((cac duc) or (cao duc)) ((van hanh) OR (van thanh)) vi cua cu".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x hoi. hieu ve ((cac duc) or (cao duc)) ((van hanh) OR (van thanh)) vi cua cu*.