Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dau tren » dau tien, dat tren, dau tieng
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
hanh di » hanh vi, hanh de, hang di
ma hoi » xa hoi, ma hoa, me hoi
co duc » co duoc, cao duc, do duc
di dau » doi dau, bi dau, di du
va co » vo co

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 ky nang ((ma hoi) or (mai hoi)). hieu va co duc van hanh di dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((ma hoi) OR (mai hoi)). hieu va co duc van hanh di dau tren.
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((ma hoi) or (mai hoi)). hieu va co duc van hanh di dau tren*.