Perhaps you should try some spelling variations:
sach tham » sach nha
va triet » va thiet, va trien, ve triet
sach thu » sach thue, sach thieu, cach thuc
hanh lam » thanh lap, hanh kem, hanh va
va hanh » van hanh, va thanh, va danh
hanh xa » hanh va, hanh ma, hanh xu
va cam » va cham, va cac, va cao
lam va » nam va, dam va, lam ha
ve cam » ve cham, ve cac, ve cai

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

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