Perhaps you should try some spelling variations:
su sach » so sach, vu sach
va danh » va dinh, va dan, va hanh
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
lap hai » lap tai, lap lai, lap hoat
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
va cam » va cham, va cac, va cao
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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 sang) or (ky tang)) lap hai. hieu va cam duc va danh ((vi cua) OR (di cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky sang) OR (ky tang)) lap hai. hieu va cam duc va danh ((vi cua) OR (di cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky sang) or (ky tang)) lap hai. hieu va cam duc va danh ((vi cua) OR (di cua)) te".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) or (ky tang)) lap hai. hieu va cam duc va danh ((vi cua) OR (di cua)) te*.