Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach thi » sach thu, sach tai, sach thieu
van hanh » van thanh, ban hanh, van ban
va triet » va thiet, va trien, ve triet
thi hanh » thi thanh
hanh xa » hanh va, hanh ma, hanh xu
van anh » van thanh, tuan anh, van minh
ve cam » ve cham, va cam, ve cai
lai va » loai va, mai va, dai va
ve cac » va cac, vien cac

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