Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
than cua » nhan cua, thai cua, ban cua
nang ra » nang ma, lang ra, nang ro
hieu ve » hieu va, hieu van
duc van » duc tan, duc manh, duc phan
cua tre » cua te, cuu tre, cua triet
tu bac » tu ban, tu cac, tu bat
tu san » thu san, tu ban, tu can
ra lai » ra glai, ru lai, va lai
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu bac) or (tu san)) ky nang ra lai. hieu ve cac ((duc van) or (duc va)) hanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bac) OR (tu san)) ky nang ra lai. hieu ve cac ((duc van) OR (duc va)) hanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu bac) or (tu san)) ky nang ra lai. hieu ve cac ((duc van) or (duc va)) hanh than cua tre*.