Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
lai cua » dai cua, hai cua, lai chau
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
ve cam » ve cac, va cam, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky sang mai hoi. hieu ((ve cam) OR (ve cham)) ((duc va) or (truc va)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang mai hoi. hieu ((ve cam) OR (ve cham)) ((duc va) OR (truc va)) hanh lai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang mai hoi. hieu ((ve cam) OR (ve cham)) ((duc va) or (truc va)) hanh lai cua tre*".