Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
nang xay » dang xay, nganh xay, nang xuan
dang hoi » dang khoi, dang hoai, dong hoi
ban dang » ban hang, ban dan, van dang
hoi cua » hoi chuc
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
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) OR (doc sach)) ky nang xay hoi. hieu ve ((cao duc) or (pham duc)) ban dang hoi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ky nang xay hoi. hieu ve ((cao duc) OR (pham duc)) ban dang hoi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ky nang xay hoi. hieu ve ((cao duc) or (pham duc)) ban dang hoi cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) ky nang xay hoi. hieu ve ((cao duc) or (pham duc)) ban dang hoi cua te*.