Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
nang ro » nang co, nang ho, nang ra
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu cac, tu bac
tu san » thu san, tu ban, tu can
ro lai » o lai, ho lai, ru 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 sac) or (tu san)) ky nang ro lai. hieu ve cac duc van hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu san)) ky nang ro lai. hieu ve cac duc van hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu san)) ky nang ro lai. hieu ve cac duc van hanh tai cuu tre*.