Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, hang di
luu van » cuu van, luan van, luu hanh
di cua » dai cua, doi cua, de cua
te sac » te sach, te cac, te san
ke cau » ket cau
ve cau » va cau, ve cac, le cau

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: ((te sac) OR (toc sach)) ky nang xa hoi. hieu ((ve cau) OR (ke cau)) luu van hanh di cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (toc sach)) ky nang xa hoi. hieu ((ve cau) or (ke cau)) luu van hanh di cua tre*.