Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
va triet » va trien, ve triet, cua triet
nam truc » nam truoc, nam thuc, nam trung
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu va » lieu va, hieu qua
hanh xa » hanh va, hanh ma, hanh xu
va nam » van nam, ha nam, va nay
thiet » thieu

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

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