Perhaps you should try some spelling variations:
trinh doc » trinh do, trinh hoa, trinh co
va trinh » van trinh, va tinh, lap trinh
tang mai » tang ma, tang tai, lang mai
cu tren » tu tren, dua tren
va cham » va chat, va tham
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
va cam » va cac, va cao, va cai
tu ban » thu ban, te ban
doc cu » doc cua, doc cuoc
tu san » thu san, tu can, vu san

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 san) OR (tu ban)) ky tang mai hoi. hieu ((va cam) OR (va cham)) duc va trinh doc cu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) OR (tu ban)) ky tang mai hoi. hieu ((va cam) or (va cham)) duc va trinh doc cu tren~".
• Adding a wildcard symbol may retrieve word variants: ((tu san) OR (tu ban)) ky tang mai hoi. hieu ((va cam) or (va cham)) duc va trinh doc cu tren*.