Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
ve cau » ke cau, ve cac, le cau
va cau » van cau, va cac, va dau
luc va » duc va, tuc va, loc va
vi cua » vai cua
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ((ve cau) OR (va cau)) luc va hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ((ve cau) OR (va cau)) luc va hanh ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((ve cau) OR (va cau)) luc va hanh ((vi cua) or (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((ve cau) OR (va cau)) luc va hanh ((vi cua) or (di cua)) tre*.