Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
va tinh » may tinh
cac tuc » cac toc, cac tu, cac tac
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ma cua
ca cua » co cua
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: vu sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cac tuc va tinh ((va cua) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cac tuc va tinh ((va cua) OR (ca cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cac tuc va tinh ((va cua) or (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cac tuc va tinh ((va cua) or (ca cua)) tre*.