Perhaps you should try some spelling variations:
dau theo » cau theo, dai theo, dam theo
qua van » quan van, qua ban, qua san
thuc va » thuc dan, thuc day
hanh va » hang va, hanh vi
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
tuc va » truc va, tuc xa, duc va
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 va) or (((thuc va) or (thuc vat)))) 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 va) OR (((thuc va) OR (thuc vat)))) hanh va dau theo.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang x hoi. hieu qua van ((tuc va) or (((thuc va) or (thuc vat)))) hanh va dau theo*.