Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
danh doi » danh di, thanh doi, dung doi
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
xa danh » va danh, dia danh, nam danh
cac toc » cac toi, cac nuoc, cac thoi
van cac » van hac, van cau, van bac
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
cuu tre » cau tren, cau treo
toc xa » tuc xa, toc ta, hoc xa

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