Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
thu sach » tu sach, thuat sach, thuoc sach
bien cac » vien cac, dien cac, bien ca
van hanh » van thanh, ban hanh, van anh
ky lang » ky dang, tay lang
ky tang » ky dang, kho tang, ky trong
cac dac » cac dan, cac dai, cac bac
dac van » cac van, dao van, dam van
vi su » va su, ve su, ki su
kien » vien, tien, dien

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: thu sach ((((ky lang) OR (ky nang))) OR (ky tang)) xa hoi. thieu bien cac dac van hanh vi su kien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((((ky lang) OR (ky nang))) or (ky tang)) xa hoi. thieu bien cac dac van hanh vi su kien~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((((ky lang) OR (ky nang))) or (ky tang)) xa hoi. thieu bien cac dac van hanh vi su kien*.