Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham tuc » nham thuc, pham thuc, tham thuc
cau tren » cu tren, dau tren, ca tren
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
hanh va » hang va
tuc va » thuc va, truc va, tuc xa
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: co sach ky nang x hoi. hieu van cham tuc va ((hanh va) OR (hanh vi)) cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky nang x hoi. hieu van cham tuc va ((hanh va) OR (hanh vi)) cau tren".
• Adding a wildcard symbol may retrieve word variants: co sach ky nang x hoi. hieu van cham tuc va ((hanh va) OR (hanh vi)) cau tren*.