Perhaps you should try some spelling variations:
thien van » thi van
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
sach ty » sach y, sach tu, sach thu
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va
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: su ((sach ty) or (sac ky)) nang x hoi. ((hieu van) OR (thien van)) cam xuc va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sac ky)) nang x hoi. ((hieu van) OR (thien van)) cam xuc va thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sac ky)) nang x hoi. ((hieu van) OR (thien van)) cam xuc va thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sac ky)) nang x hoi. ((hieu van) OR (thien van)) cam xuc va thanh vai cua tre*.