Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
van hanh » van thanh, ban hanh, van anh
than cua » nhan cua, thai cua, ban cua
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
tu can » tu ban, tu cac, thu canh
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
o lai » o lao

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) or (tu can)) ky nang o lai. hieu ve cac duc van hanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu can)) ky nang o lai. hieu ve cac duc van hanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu can)) ky nang o lai. hieu ve cac duc van hanh than cua tre*.