Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
danh du » danh dau, danh tu, dinh du
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
va cao » va cac, va co, va dao
luc va » duc va, tuc va
loc va » hoc va
du cua » duy cua, dau cua, dum cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (doc sach)) v nang xa hoi. lieu va cao ((luc va) or (loc va)) danh du cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) v nang xa hoi. lieu va cao ((luc va) OR (loc va)) danh du cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) v nang xa hoi. lieu va cao ((luc va) or (loc va)) danh du cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) v nang xa hoi. lieu va cao ((luc va) or (loc va)) danh du cua tre*.