Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh loc » thanh loi, thanh hoc, thanh long
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, tu cach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vu nang » vuc nang, va nang, vu dang
te sach » toc sach
v nang » va nang, van nang, voi nang
loc va » hoc va, luc va
ma hoi » mai hoi, xa hoi, ma hoa

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) OR (te sach)) ((v nang) or (vu nang)) ma hoi. hieu van thanh loc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ((v nang) OR (vu nang)) ma hoi. hieu van thanh loc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ((v nang) or (vu nang)) ma hoi. hieu van thanh loc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ((v nang) or (vu nang)) ma hoi. hieu van thanh loc va hanh vai cua tre*.