Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
hanh va » hanh vi
lam loc » lam duoc, lam ngoc
van lam » van nam
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
loc va » hoc va, luc va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ty lang xa hoi. thien van lam loc va ((hanh va) OR (hang va)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ty lang xa hoi. thien van lam loc va ((hanh va) or (hang va)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) ty lang xa hoi. thien van lam loc va ((hanh va) or (hang va)) cua tre*.