Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ky trong » ly trong, ke trong, cay trong
lap hoat » tap hoa, dan hoat, lap dat
cam duc » cam xuc, cao duc, pham duc
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
ky dang » ky nang, ky danh
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky trong) or (ky dang)) lap hoat. hieu van cam duc va danh ((vi cua) OR (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky trong) OR (ky dang)) lap hoat. hieu van cam duc va danh ((vi cua) OR (vai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky trong) or (ky dang)) lap hoat. hieu van cam duc va danh ((vi cua) OR (vai cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky trong) or (ky dang)) lap hoat. hieu van cam duc va danh ((vi cua) OR (vai cua)) te*.