Perhaps you should try some spelling variations:
sach bai » sach dao, cac bai, sach xa
duc manh » suc manh, duc anh, duc minh
cac duc » cac du, cao duc, cac dac
hanh di » hanh de, hang di, danh di
cua chu » sua chua
sach ki » sach kinh, sach kem, sach doi
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac

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 ((sach ki) OR (sach bai)) nang xa hoi. hieu ve cac duc manh ((hanh di) OR (hanh vi)) cua chu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ki) or (sach bai)) nang xa hoi. hieu ve cac duc manh ((hanh di) OR (hanh vi)) cua chu~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ki) or (sach bai)) nang xa hoi. hieu ve cac duc manh ((hanh di) OR (hanh vi)) cua chu*.