Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, dai khoa
cac khoi » cac thoi, cac khoan, cach thoi
nam duoc » nam thuoc, da duoc, dat duoc
va thanh » gia thanh, ban thanh, va tinh
duoc va » nuoc va, duc va, duoc ma
san ky » sang ky, van ky, dan ky
va nam » van nam, ha nam, va nay
vi cua » vai cua
di cua » dai cua, doi cua, de cua
phi » phai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: phi san ky nang ((mai khoi) OR (cac khoi)). lieu va nam duoc va thanh ((vi cua) OR (di cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "phi san ky nang ((mai khoi) OR (cac khoi)). lieu va nam duoc va thanh ((vi cua) or (di cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: phi san ky nang ((mai khoi) OR (cac khoi)). lieu va nam duoc va thanh ((vi cua) or (di cua)) tre*.