Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
luoc van » luoc va, luc van, luot van
luoc can » luc canh, hoc can, luoc dai
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
y nang » ky nang, ly nang, v nang
di cua » doi cua, de cua, do cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x ho. hieu van cau ((luoc van) OR (luoc can)) hanh ((di cua) OR (dai cua)) vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x ho. hieu van cau ((luoc van) OR (luoc can)) hanh ((di cua) or (dai cua)) vat~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x ho. hieu van cau ((luoc van) OR (luoc can)) hanh ((di cua) or (dai cua)) vat*.