Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
ve triet » va trien, su triet
sach thu » sach thieu, sach tham, cach thuc
va triet » va thiet, va trien, cua triet
va hanh » van hanh, va thanh, va danh
hanh xa » hanh va, hanh ma, hanh xu
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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