Perhaps you should try some spelling variations:
cach thiet » cach thien, sach thieu, tich thiet
cac thiet » cad thiet, cam thiet, can thiet
cac theo » cau theo, chan theo, chuc theo
qua van » quan van, qua ban, qua san
van tuc » van thuc, van tu, van duc
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
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: su sac ky nang x hoi. hieu qua van tuc va hanh va ((cac theo) or (((cac thiet) OR (cach thiet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang x hoi. hieu qua van tuc va hanh va ((cac theo) OR (((cac thiet) OR (cach thiet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang x hoi. hieu qua van tuc va hanh va ((cac theo) or (((cac thiet) OR (cach thiet))))".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang x hoi. hieu qua van tuc va hanh va ((cac theo) or (((cac thiet) OR (cach thiet))))*.