Perhaps you should try some spelling variations:
tang thanh » dang thanh, trung thanh, hoang thanh
thanh vai » thanh hai, thanh van, thanh tai
duc tang » duc thang, duc tan, tuc tang
hieu van » hieu va, thien van, lieu va
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
bao duc » dao duc, bao luc, cao duc
van bao » van ban, van dao
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
lv nang » ly nang
v nang » va nang, vu nang, van 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: ((te sach) or (su sach)) ((v nang) or (lv nang)) x hoi. hieu van bao duc tang thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ((v nang) OR (lv nang)) x hoi. hieu van bao duc tang thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ((v nang) or (lv nang)) x hoi. hieu van bao duc tang thanh vai cua tre*.