Perhaps you should try some spelling variations:
te sach » toc sach
cac toc » cac toi, cac nuoc, cac thoi
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
xa danh » va danh, dia danh, nam danh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
toc xa » tuc xa, toc ta, hoc xa
ve cac » va cac, vien cac

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

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