Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
lieu van » hieu van, sieu van, lieu nano
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 ky nang o hoi. ((lieu van) or (lieu va)) nam ((xuc va) OR (luc va)) thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang o hoi. ((lieu van) OR (lieu va)) nam ((xuc va) OR (luc va)) thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang o hoi. ((lieu van) or (lieu va)) nam ((xuc va) OR (luc va)) thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang o hoi. ((lieu van) or (lieu va)) nam ((xuc va) OR (luc va)) thanh vai cua tre*.