Perhaps you should try some spelling variations:
so sach » so sanh, co sach, hoc sach
thuc va » thuc vat, thuc dan, thuc day
van hai » van ha, van chat, van hanh
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
bo sach » co sach, hoc sach
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca 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) OR (bo sach)) ty nang xa hoi. hieu ((van cac) OR (van hai)) thuc va dan va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) ty nang xa hoi. hieu ((van cac) or (van hai)) thuc va dan va cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (bo sach)) ty nang xa hoi. hieu ((van cac) or (van hai)) thuc va dan va cua tre*.