Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
kho tang » cao tang
lap hoat » tap hoa, dan hoat, lap dat
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
tu sach » thu sach, su sach, te sach
nam xuc » cam xuc, nam xua, nam thuc
ky dang » ky nang, ky danh
vi cua » vai cua, di cua
cua te » cua tu

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 ((kho tang) or (ky dang)) lap hoat. hieu van nam xuc ((va danh) OR (va hanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((kho tang) OR (ky dang)) lap hoat. hieu van nam xuc ((va danh) OR (va hanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((kho tang) or (ky dang)) lap hoat. hieu van nam xuc ((va danh) OR (va hanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((kho tang) or (ky dang)) lap hoat. hieu van nam xuc ((va danh) OR (va hanh)) vi cua te*.