Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, nhanh thanh
hanh phan » thanh phan, anh phan, hanh han
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
tu sac » tu sach, tu cac, tu bac
nang o » nang co, nang ho, nang ro
tu san » thu san, tu ban, tu can
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 san)) ky nang o lai. hieu ve cac duc van ((hanh than) OR (hanh phan)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu san)) ky nang o lai. hieu ve cac duc van ((hanh than) OR (hanh phan)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (tu san)) ky nang o lai. hieu ve cac duc van ((hanh than) OR (hanh phan)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu san)) ky nang o lai. hieu ve cac duc van ((hanh than) OR (hanh phan)) cua tre*.