Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hanh ve » hanh va, hanh kem
ca tren » cau tren, cu tren, la tren
ty nang » ky nang, ty xang, ty hang
va cao » va cac, va co, va dao
ve cac » va cac, vien cac
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: su sach ty nang x hoi. hieu ((va cao) or (ve cac)) duc va ((hanh ve) or (hanh vi)) ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu ((va cao) OR (ve cac)) duc va ((hanh ve) OR (hanh vi)) ca tren.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu ((va cao) or (ve cac)) duc va ((hanh ve) or (hanh vi)) ca tren*.