Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
te sach » toc sach
sach ky » sac ky, sach y, sach ty
kem cua » em cua, keo cua, diem cua
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » dai hoi, lai hoi, mai doi
cua tre » cua te, cuu tre, cua triet
cuu va » cuu van

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 nang ((mai hoi) OR (mai khoi)). hieu ve cham ((cuu va) or (cuu ve)) hanh kem cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((mai hoi) OR (mai khoi)). hieu ve cham ((cuu va) OR (cuu ve)) hanh kem cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((mai hoi) OR (mai khoi)). hieu ve cham ((cuu va) or (cuu ve)) hanh kem cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((mai hoi) OR (mai khoi)). hieu ve cham ((cuu va) or (cuu ve)) hanh kem cua tre*.