Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
tai cua » thai cua, tai cuc, tri cua
soc van » hoc van, oc van, sac van
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
tu ban » thu ban, te ban
tu can » tu cac, thu canh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu can) or (tu ban)) ((ky lang) or (ky tang)) xa hoi. hieu van cham soc van hanh tai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu can) OR (tu ban)) ((ky lang) OR (ky tang)) xa hoi. hieu van cham soc van hanh tai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu can) or (tu ban)) ((ky lang) or (ky tang)) xa hoi. hieu van cham soc van hanh tai cua viet*.