Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
van tham » van tuan, van chat, van tai
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
soc va » hoc va, loc va, doc va
vi hoa » voi hoa, vi hoc, 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) OR (vu sach)) y nang xa hoi. hieu ((van tham) OR (van thanh)) soc va hanh vi hoa viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (vu sach)) y nang xa hoi. hieu ((van tham) OR (van thanh)) soc va hanh vi hoa viet~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (vu sach)) y nang xa hoi. hieu ((van tham) OR (van thanh)) soc va hanh vi hoa viet*.