Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
than cua » nhan cua, thai cua, ban cua
phan cua » nhan cua, phat cua, han cua
nang ho » nang hoc, nang co, tang ho
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
ve cac » va cac, vien cac
ho lai » o lai
tu can » tu ban, thu canh

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

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