Perhaps you should try some spelling variations:
qua thanh » quan thanh, cua thanh, qua than
thanh soc » thanh son, nhanh soc, thanh hoc
vien cac » vien bach, vien dai, vien da
van dinh » van minh, van dich, va dinh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
soc van » hoc van, oc van, sac van
di cau » diem cau
da cau » dat cau, va cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: vien cac ky lang xa hoi. hieu qua thanh soc van dinh ((di cau) or (da cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vien cac ky lang xa hoi. hieu qua thanh soc van dinh ((di cau) OR (da cau)) tren.
• Adding a wildcard symbol may retrieve word variants: vien cac ky lang xa hoi. hieu qua thanh soc van dinh ((di cau) or (da cau)) tren*.