Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
te sach » toc sach
lai cua » dai cua, hai cua, lai chau
truc va » thuc va, thuc vat, trung va
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
ma hoi » xa hoi, ma hoa, me hoi

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

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