Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
nang ma » tang ma, sang ma, nang cao
van hai » van ha, van chat, van hanh
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
su cac » su cao, su can, eu cac
va hai » va chai, va khai, va bai
luc va » duc va, tuc va, loc va
ve dau » va dau, ve du, ke dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su cac) or (tu cac)) ky nang ma hoa. hieu ((va hai) or (van hai)) luc va hanh ve dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su cac) OR (tu cac)) ky nang ma hoa. hieu ((va hai) OR (van hai)) luc va hanh ve dau tren.
• Adding a wildcard symbol may retrieve word variants: ((su cac) or (tu cac)) ky nang ma hoa. hieu ((va hai) or (van hai)) luc va hanh ve dau tren*.