Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
ly nang » ly hang, ly vang, ly quang
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
cuu tre » cua tre, cau tren, cau treo
vu bac » vu bach, vu ban, xu bac
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu bac ((ly nang) OR (ky nang)) xa hoi. hieu qua cac duc van hanh vi ((cuu tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bac ((ly nang) OR (ky nang)) xa hoi. hieu qua cac duc van hanh vi ((cuu tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: vu bac ((ly nang) OR (ky nang)) xa hoi. hieu qua cac duc van hanh vi ((cuu tre) or (cua te))*.