Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lam » thanh lap, hanh kem, hanh va
lam cua » nam cua, lam chat
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
ky lang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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 sach ky lang ((mai hoi) OR (lai hoi)). hieu ve cam ((duc va) OR (truc va)) hanh lam cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang ((mai hoi) OR (lai hoi)). hieu ve cam ((duc va) or (truc va)) hanh lam cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang ((mai hoi) OR (lai hoi)). hieu ve cam ((duc va) or (truc va)) hanh lam cua triet*.