Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
vu sach » vu bach, vu khach
dat cua » dai cua, day cua, mat cua
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
ly hang » ly quang
su sach » so sach
cua tre » cua te, cuu tre, cua triet
ve cau » ke cau, va cau, ve cac
luc va » tuc va, loc va

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

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