Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
va cau » va cac, va dau, va cao
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach thu)) nang xa hoi. lieu ((va cau) OR (van cau)) truc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) nang xa hoi. lieu ((va cau) OR (van cau)) truc van hanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach thu)) nang xa hoi. lieu ((va cau) OR (van cau)) truc van hanh di cua tre*".