Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
danh vai » danh sai, danh va, doanh van
doanh va » doan va, doanh tai, doanh cua
tu sach » su sach, te sach, tu cach
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve hoc » te hoc, va hoc, vi hoc
nuoc » quoc, duoc, ngoc

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. hieu ve hoc nuoc va ((danh vai) or (doanh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty xang xa hoi. hieu ve hoc nuoc va ((danh vai) OR (doanh va)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ty xang xa hoi. hieu ve hoc nuoc va ((danh vai) or (doanh va)) cuu tre*.