Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
thanh van » thanh toan, thanh phan, thanh nhan
cao suc » cao su, cao duc
hieu va » lieu va, hieu qua
ly vang » ly hang, ly quang
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
suc va » duc va, tuc va, luc va
ly van » le van, ly va, ly von

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach ((ly vang) or (ly van)) xa hoi. hieu va cao suc va ((thanh van) OR (thanh san)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc sach ((ly vang) OR (ly van)) xa hoi. hieu va cao suc va ((thanh van) OR (thanh san)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ((ly vang) or (ly van)) xa hoi. hieu va cao suc va ((thanh van) OR (thanh san)) cua tre".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ((ly vang) or (ly van)) xa hoi. hieu va cao suc va ((thanh van) OR (thanh san)) cua tre*.