Perhaps you should try some spelling variations:
dau theo » cau theo, dai theo, dam theo
van tuc » van thuc, van duc, van tue
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
van tu » van thu, van du, ban tu
va dau » va dao
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 ((van tuc) or (van tu)) va hanh va dau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang x hoi. hieu qua ((van tuc) OR (van tu)) va hanh va dau theo.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang x hoi. hieu qua ((van tuc) or (van tu)) va hanh va dau theo*.