Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
xa danh » va danh, dia danh, nam danh
sach ky » sac ky, sach y, sach ty
cac tuc » cac toc, cac tac, cac nuoc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, mang may
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang ma) OR (nang cao)) hoi. hieu ve ((cac tuc) or (cac tu)) xa danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang ma) OR (nang cao)) hoi. hieu ve ((cac tuc) OR (cac tu)) xa danh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang ma) OR (nang cao)) hoi. hieu ve ((cac tuc) or (cac tu)) xa danh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang ma) OR (nang cao)) hoi. hieu ve ((cac tuc) or (cac tu)) xa danh doi cua tre*.