Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
van hanh » van thanh, ban hanh, van anh
diem cau » dieu can
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
va cam » va cham, va cac, va cao
da cau » dat cau, va cau

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