Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
so sach » so sanh, bo sach, co sach
tue cua » te cua
ve cam » ve cham, ve cac, ve cai
le cua » ly cua
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach van nang x hoi. hieu ((ve cam) OR (va cam)) truc van hanh ((le cua) or (tue cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach van nang x hoi. hieu ((ve cam) OR (va cam)) truc van hanh ((le cua) OR (tue cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach van nang x hoi. hieu ((ve cam) OR (va cam)) truc van hanh ((le cua) or (tue cua)) tre".
• Adding a wildcard symbol may retrieve word variants: so sach van nang x hoi. hieu ((ve cam) OR (va cam)) truc van hanh ((le cua) or (tue cua)) tre*.