Perhaps you should try some spelling variations:
su sach » so sach, vu sach
te sach » toc sach
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
hanh va » hang va, hanh vi
su tien » su kien, su hien, tu tieng
loc va » hoc va, luc va
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) or (te sach)) ky nang x hoi. hieu vu cham ((duc va) or (loc va)) hanh va su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang x hoi. hieu vu cham ((duc va) OR (loc va)) hanh va su tien.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang x hoi. hieu vu cham ((duc va) or (loc va)) hanh va su tien*.