Perhaps you should try some spelling variations:
tang thanh » trung thanh, hoang thanh, quang thanh
dang thanh » dong thanh, dang hanh, hoang thanh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
dao duc » giao duc, tao duoc
sach lo » sach dao, sach doi, sach hoi
cao duc » cao suc, giao duc, tao duoc
lo nang » ho nang, ly nang, loai nang
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 lo nang x hoi. hieu van ((cao duc) or (dao duc)) ((tang thanh) OR (dang thanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach lo nang x hoi. hieu van ((cao duc) OR (dao duc)) ((tang thanh) OR (dang thanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo nang x hoi. hieu van ((cao duc) or (dao duc)) ((tang thanh) OR (dang thanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach lo nang x hoi. hieu van ((cao duc) or (dao duc)) ((tang thanh) OR (dang thanh)) vai cua tre*.