Perhaps you should try some spelling variations:
vat trinh » va trinh, van trinh, viet trinh
pham thuc » phap thuc, pham chuc, nham thuc
van chua » va chua, van chu, van cua
van chia » van chi, ban chia, van chien
mai hoi » mai khoi, lai hoi, mai doi
dai hoi » dai hoc, dai hai, dai moi
tu cao » cu cao, tu cac, vu cao
hieu v » hieu va, hieu ve, hieu 2
v pham » vi pham, d pham

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: tu cao ky nang ((mai hoi) OR (dai hoi)). hieu v pham thuc vat trinh ((van chua) OR (van chia)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cao ky nang ((mai hoi) OR (dai hoi)). hieu v pham thuc vat trinh ((van chua) or (van chia)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu cao ky nang ((mai hoi) OR (dai hoi)). hieu v pham thuc vat trinh ((van chua) or (van chia)) tre*.