Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
su sach » so sach, vu sach
cua tre » cuu tre, cua triet, dua tren
xa danh » va danh, dia danh, nam danh
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
ve cac » va cac, vien cac
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: su sach ky ((nang ma) OR (tang ma)) hoi. hieu ve cac tuc xa danh doi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang ma) OR (tang ma)) hoi. hieu ve cac tuc xa danh doi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang ma) OR (tang ma)) hoi. hieu ve cac tuc xa danh doi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang ma) OR (tang ma)) hoi. hieu ve cac tuc xa danh doi ((cua tre) or (cua te))*.