Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
cua tre » cua te, cuu tre, cua triet
xu van » tu van, vu van, su van
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang ((x hoi) or (x ho)). hieu ve chao xu van hanh vi ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((x hoi) OR (x ho)). hieu ve chao xu van hanh vi ((cua tre) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((x hoi) or (x ho)). hieu ve chao xu van hanh vi ((cua tre) or (cua viet))*.