Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
tang mai » tang tai, lang mai, sang mai
sach ky » sach y, sach ty, sach kem
doi cua » dai cua, hoi cua
xa danh » va danh, dia danh, nam danh
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
sac ky » cac ky, sai ky
tu xa » tu xay, tu va, te xa

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

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