Perhaps you should try some spelling variations:
khanh than » khanh thanh, khanh thuan, khan than
su thoai » su thi, su tai, su hai
cac tang » cao tang, ca tang, cac bang
cac dang » cao dang, cac dan, cac cong
va khanh » van khanh, va thanh, vu khanh
than cua » nhan cua, thai cua, ban cua
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su thoai ((cac tang) or (cac dang)) xa hoi. hieu ve cam duc va khanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su thoai ((cac tang) OR (cac dang)) xa hoi. hieu ve cam duc va khanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: su thoai ((cac tang) or (cac dang)) xa hoi. hieu ve cam duc va khanh than cua tre*.