Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
sang xa » song xa, lang xa, sang ma
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
xa danh » va danh, dia danh, nam danh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
va dan » ca dan, va dao, va dau

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 sang xa hoi. hieu ve cac tuc ((xa danh) or (va dan)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang xa hoi. hieu ve cac tuc ((xa danh) OR (va dan)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang xa hoi. hieu ve cac tuc ((xa danh) or (va dan)) dai cua tre*.