Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
chat cuu » chat huu, chat cua, cham cuu
va danh » va dinh, va dan, va hanh
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cuu va » cuu van, cuu ve
y nang » ky nang, ly nang, v nang
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y nang xa hoi. hieu ve chat cuu va danh ((vi cua) OR (di cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y nang xa hoi. hieu ve chat cuu va danh ((vi cua) or (di cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y nang xa hoi. hieu ve chat cuu va danh ((vi cua) or (di cua)) tre*.