Perhaps you should try some spelling variations:
thien van » thi van
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
duc bao » du bao, duc dao, duc ban
y nang » ky nang, ly nang, v nang
duc ba » duc ban, duc va, duc ha
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: so sach y nang xa hoi. thien van cau ((duc ba) OR (duc bao)) benh ((vi cua) OR (di cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. thien van cau ((duc ba) OR (duc bao)) benh ((vi cua) or (di cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. thien van cau ((duc ba) OR (duc bao)) benh ((vi cua) or (di cua)) tre*.