Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang hai » dang khai, hang hai, dung hai
cay phoi » cap phoi, tay hoi, cay cho
ban dang » ban hang, ban dan, van dang
xay hoi » xa hoi, tay hoi, gay thoi
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cao duc » dao duc, cao suc, giao duc
cua te » cua tu

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 ((xay hoi) OR (cay phoi)). hieu ve ((cao duc) or (pham duc)) ban dang hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((xay hoi) OR (cay phoi)). hieu ve ((cao duc) OR (pham duc)) ban dang hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ((xay hoi) OR (cay phoi)). hieu ve ((cao duc) or (pham duc)) ban dang hai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((xay hoi) OR (cay phoi)). hieu ve ((cao duc) or (pham duc)) ban dang hai cua te*.