Perhaps you should try some spelling variations:
thien van » thi van
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
sach ly » sach y, sach lo, sach ty
dan ban » van ban, can ban, dan bac
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
dan ba » dan bac, dan ca, dan va

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: tu sach ly nang xa hoi. thien van cac ((dan ban) OR (dan ba)) thanh ((vai cua) OR (hai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang xa hoi. thien van cac ((dan ban) OR (dan ba)) thanh ((vai cua) or (hai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang xa hoi. thien van cac ((dan ban) OR (dan ba)) thanh ((vai cua) or (hai cua)) tre*.