Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
truc va » thuc va, thuc vat, trung va
lai cua » hai cua, lai chau, thai cua
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
tu sac » tu sach, tu cac, tu 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 sac ky sang mai hoi. hieu ve cam ((duc va) OR (truc va)) hanh ((lai cua) OR (dai cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang mai hoi. hieu ve cam ((duc va) or (truc va)) hanh ((lai cua) OR (dai cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang mai hoi. hieu ve cam ((duc va) or (truc va)) hanh ((lai cua) OR (dai cua)) triet*.