Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
toc sach » hoc sach, doc sach, thuoc sach
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
y nang » ky nang, v nang, may nang
xuc va » duc va, tuc va, luc va
ve hoa » ve khoa, ve hoat, va hoa

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: toc sach ((y nang) OR (ly nang)) x ho. ((hieu van) OR (hieu va)) cam xuc va hanh ve hoa viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y nang) OR (ly nang)) x ho. ((hieu van) or (hieu va)) cam xuc va hanh ve hoa viet~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) OR (ly nang)) x ho. ((hieu van) or (hieu va)) cam xuc va hanh ve hoa viet*.