Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
van cac » van hac, van cau, dan cac
van bac » van ban, van bao, van hac
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky tang xa hoi. hieu ((van cac) or (van bac)) duc van hanh vi ((cua tre) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky tang xa hoi. hieu ((van cac) OR (van bac)) duc van hanh vi ((cua tre) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky tang xa hoi. hieu ((van cac) or (van bac)) duc van hanh vi ((cua tre) or (cua su))*.