Perhaps you should try some spelling variations:
su sach » vu sach
via cua » gia cua, gian cua, giau cua
va hanh » van hanh, va thanh, va danh
dau tuc » dau tu, dao tuc, cau truc
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
tuc va » thuc va, truc va, tuc xa
va cua » va chua, ca cua, ma cua
va dau » va dao

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) or (so sach)) ky dang xa hoi. lieu va dau tuc va hanh ((va cua) OR (via cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky dang xa hoi. lieu va dau tuc va hanh ((va cua) OR (via cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky dang xa hoi. lieu va dau tuc va hanh ((va cua) OR (via cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky dang xa hoi. lieu va dau tuc va hanh ((va cua) OR (via cua)) tre*.