Perhaps you should try some spelling variations:
thien van » thi van
thu sach » thuat sach, thuoc sach, thu hoach
thanh vi » hanh vi, thanh va, nhanh vi
thanh ve » hanh ve, thanh va, thanh vien
tu sach » su sach, te sach, tu cach
xang xa » lang xa, mang xa, ang xa
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ty xang xa hoi. thien van nam cua ban ((thanh vi) OR (thanh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty xang xa hoi. thien van nam cua ban ((thanh vi) OR (thanh ve)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ty xang xa hoi. thien van nam cua ban ((thanh vi) OR (thanh ve)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ty xang xa hoi. thien van nam cua ban ((thanh vi) OR (thanh ve)) cua tre*.