Perhaps you should try some spelling variations:
qua ban » cua ban, qua quan
ban tum » ban tu
va hang » van hang, va nang, va lang
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
tum va » tm va, tim va, tum xa
va cau » van cau, va cac, va dau
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 sac ky nang x hoi. hieu qua ban tum va hang va cau thi~.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang x hoi. hieu qua ban tum va hang va cau thi*.