Perhaps you should try some spelling variations:
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
hanh lam » thanh lap, hanh kem, hanh va
va triet » va thiet, va trien, ve triet
hanh xa » hanh va, hanh ma, hanh xu
hieu ve » hieu va, hieu van
duc van » duc va, duc manh, duc phan
ve cac » va cac, vien cac
lam va » nam va, dam va, lam ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach thu) or (sach tham)) hanh xa hoi. hieu ve cac ((duc van) OR (duc tan)) hanh lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach tham)) hanh xa hoi. hieu ve cac ((duc van) OR (duc tan)) hanh lam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thu) or (sach tham)) hanh xa hoi. hieu ve cac ((duc van) OR (duc tan)) hanh lam va triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach tham)) hanh xa hoi. hieu ve cac ((duc van) OR (duc tan)) hanh lam va triet*.