Perhaps you should try some spelling variations:
sinh sach » chinh sach, sinh san, sang sach
tinh sach » tinh cach, tinh mach, tinh xach
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van anh » van thanh, tuan anh, van minh
cuu tre » cua tre, cau tren, cau treo
anh vi » hanh vi, anh va, anh ve
cua te » cua tu

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 ky nang xa hoi. lieu va ((tinh sach) OR (sinh sach)) van anh vi ((cuu tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. lieu va ((tinh sach) OR (sinh sach)) van anh vi ((cuu tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. lieu va ((tinh sach) OR (sinh sach)) van anh vi ((cuu tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. lieu va ((tinh sach) OR (sinh sach)) van anh vi ((cuu tre) or (cua te))*.